{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2022-49441", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.570Z", "datePublished": "2025-02-26T02:12:54.649Z", "dateUpdated": "2025-02-26T02:12:54.649Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-02-26T02:12:54.649Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix deadlock caused by calling printk() under tty_port->lock\n\npty_write() invokes kmalloc() which may invoke a normal printk() to print\nfailure message. This can cause a deadlock in the scenario reported by\nsyz-bot below:\n\n CPU0 CPU1 CPU2\n ---- ---- ----\n lock(console_owner);\n lock(&port_lock_key);\n lock(&port->lock);\n lock(&port_lock_key);\n lock(&port->lock);\n lock(console_owner);\n\nAs commit dbdda842fe96 (\"printk: Add console owner and waiter logic to\nload balance console writes\") said, such deadlock can be prevented by\nusing printk_deferred() in kmalloc() (which is invoked in the section\nguarded by the port->lock). But there are too many printk() on the\nkmalloc() path, and kmalloc() can be called from anywhere, so changing\nprintk() to printk_deferred() is too complicated and inelegant.\n\nTherefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so\nthat printk() will not be called, and this deadlock problem can be\navoided.\n\nSyzbot reported the following lockdep error:\n\n======================================================\nWARNING: possible circular locking dependency detected\n5.4.143-00237-g08ccc19a-dirty #10 Not tainted\n------------------------------------------------------\nsyz-executor.4/29420 is trying to acquire lock:\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline]\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023\n\nbut task is already holding lock:\nffff8880119c9158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #2 (&port->lock){-.-.}-{2:2}:\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n tty_port_tty_get drivers/tty/tty_port.c:288 [inline] \t\t<-- lock(&port->lock);\n tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47\n serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767\n serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854\n serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] \t<-- lock(&port_lock_key);\n serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870\n serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126\n __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156\n [...]\n\n-> #1 (&port_lock_key){-.-.}-{2:2}:\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198\n\t\t\t\t\t\t\t\t\t\t<-- lock(&port_lock_key);\n call_console_drivers kernel/printk/printk.c:1819 [inline]\n console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504\n vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024\t\t\t<-- lock(console_owner);\n vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394\n printk+0xba/0xed kernel/printk/printk.c:2084\n register_console+0x8b3/0xc10 kernel/printk/printk.c:2829\n univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681\n console_init+0x49d/0x6d3 kernel/printk/printk.c:2915\n start_kernel+0x5e9/0x879 init/main.c:713\n secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241\n\n-> #0 (console_owner){....}-{0:0}:\n [...]\n lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734\n console_trylock_spinning kernel/printk/printk.c:1773 \n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/tty_buffer.c"], "versions": [{"version": "d83904cb2eb2c4d937eaf15032214b0578f25099", "lessThan": "4af21b12a60ed2d3642284f4f85b42d7dc6ac246", "status": "affected", "versionType": "git"}, {"version": "deb1feaad03a78b545c949e54582ae57b3c56982", "lessThan": "4c253caf9264d2aa47ee806a87986dd8eb91a5d9", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "04ee31678c128a6cc7bb057ea189a8624ba5a314", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "3219ac364ac3d8d30771612a6010f1e0b7fa0a28", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "9834b13e8b962caa28fbcf1f422dd82413da4ede", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "18ca0d55e8639b911df8aae1b47598b13f9acded", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "b3c974501d0c32258ae0e04e5cc3fb92383b40f6", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "0bcf44903ef4df742dcada86ccaedd25374ffb50", "status": "affected", "versionType": "git"}, {"version": "b6da31b2c07c46f2dcad1d86caa835227a16d9ff", "lessThan": "6b9dbedbe3499fef862c4dff5217cf91f34e43b3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/tty_buffer.c"], "versions": [{"version": "4.18", "status": "affected"}, {"version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver"}, {"version": "4.9.318", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.283", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.247", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.198", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.121", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/4af21b12a60ed2d3642284f4f85b42d7dc6ac246"}, {"url": "https://git.kernel.org/stable/c/4c253caf9264d2aa47ee806a87986dd8eb91a5d9"}, {"url": "https://git.kernel.org/stable/c/04ee31678c128a6cc7bb057ea189a8624ba5a314"}, {"url": "https://git.kernel.org/stable/c/3219ac364ac3d8d30771612a6010f1e0b7fa0a28"}, {"url": "https://git.kernel.org/stable/c/9834b13e8b962caa28fbcf1f422dd82413da4ede"}, {"url": "https://git.kernel.org/stable/c/18ca0d55e8639b911df8aae1b47598b13f9acded"}, {"url": "https://git.kernel.org/stable/c/b3c974501d0c32258ae0e04e5cc3fb92383b40f6"}, {"url": "https://git.kernel.org/stable/c/0bcf44903ef4df742dcada86ccaedd25374ffb50"}, {"url": "https://git.kernel.org/stable/c/6b9dbedbe3499fef862c4dff5217cf91f34e43b3"}], "title": "tty: fix deadlock caused by calling printk() under tty_port->lock", "x_generator": {"engine": "bippy-5f407fcff5a0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3E38B3B3-C9B4-4F8E-B27F-E121FA35D422", "versionEndExcluding": "3.19", "versionStartIncluding": "3.18.118", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9F7ABD11-7E25-4617-AD4B-2068A90C7EF8", "versionEndExcluding": "4.5", "versionStartIncluding": "4.4.146", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FF4DA68C-0A82-4061-AEA7-59632762D9E2", "versionEndExcluding": "4.9.318", "versionStartIncluding": "4.9.117", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "378D8F4C-4F16-4488-9872-625DEA9B337A", "versionEndExcluding": "4.14.283", "versionStartIncluding": "4.14.60", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A0236C89-21F4-4889-AA04-D7985FBBD23F", "versionEndExcluding": "4.19.247", "versionStartIncluding": "4.17.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3EC49633-14DE-4EBD-BB80-76AE2E3EABB9", "versionEndExcluding": "5.4.198", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "34ACD872-E5BC-401C-93D5-B357A62426E0", "versionEndExcluding": "5.10.121", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "20D41697-0E8B-4B7D-8842-F17BF2AA21E1", "versionEndExcluding": "5.15.46", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15E2DD33-2255-4B76-9C15-04FF8CBAB252", "versionEndExcluding": "5.17.14", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8E122216-2E9E-4B3E-B7B8-D575A45BA3C2", "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.18", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix deadlock caused by calling printk() under tty_port->lock\n\npty_write() invokes kmalloc() which may invoke a normal printk() to print\nfailure message. This can cause a deadlock in the scenario reported by\nsyz-bot below:\n\n CPU0 CPU1 CPU2\n ---- ---- ----\n lock(console_owner);\n lock(&port_lock_key);\n lock(&port->lock);\n lock(&port_lock_key);\n lock(&port->lock);\n lock(console_owner);\n\nAs commit dbdda842fe96 (\"printk: Add console owner and waiter logic to\nload balance console writes\") said, such deadlock can be prevented by\nusing printk_deferred() in kmalloc() (which is invoked in the section\nguarded by the port->lock). But there are too many printk() on the\nkmalloc() path, and kmalloc() can be called from anywhere, so changing\nprintk() to printk_deferred() is too complicated and inelegant.\n\nTherefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so\nthat printk() will not be called, and this deadlock problem can be\navoided.\n\nSyzbot reported the following lockdep error:\n\n======================================================\nWARNING: possible circular locking dependency detected\n5.4.143-00237-g08ccc19a-dirty #10 Not tainted\n------------------------------------------------------\nsyz-executor.4/29420 is trying to acquire lock:\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline]\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023\n\nbut task is already holding lock:\nffff8880119c9158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #2 (&port->lock){-.-.}-{2:2}:\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n tty_port_tty_get drivers/tty/tty_port.c:288 [inline] \t\t<-- lock(&port->lock);\n tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47\n serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767\n serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854\n serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] \t<-- lock(&port_lock_key);\n serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870\n serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126\n __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156\n [...]\n\n-> #1 (&port_lock_key){-.-.}-{2:2}:\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\n serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198\n\t\t\t\t\t\t\t\t\t\t<-- lock(&port_lock_key);\n call_console_drivers kernel/printk/printk.c:1819 [inline]\n console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504\n vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024\t\t\t<-- lock(console_owner);\n vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394\n printk+0xba/0xed kernel/printk/printk.c:2084\n register_console+0x8b3/0xc10 kernel/printk/printk.c:2829\n univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681\n console_init+0x49d/0x6d3 kernel/printk/printk.c:2915\n start_kernel+0x5e9/0x879 init/main.c:713\n secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241\n\n-> #0 (console_owner){....}-{0:0}:\n [...]\n lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734\n console_trylock_spinning kernel/printk/printk.c:1773 \n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: se corrige el bloqueo causado por llamar a printk() bajo tty_port-&gt;lock pty_write() invoca kmalloc() que puede invocar un printk() normal para imprimir un mensaje de error. Esto puede causar un bloqueo en el escenario informado por syz-bot a continuaci\u00f3n: CPU0 CPU1 CPU2 ---- ---- ---- lock(console_owner); lock(&amp;port_lock_key); lock(&amp;port-&gt;lock); lock(&amp;port_lock_key); lock(&amp;port-&gt;lock); lock(console_owner); Como dijo el commit dbdda842fe96 (\"printk: Agregar l\u00f3gica de propietario y espera de consola para equilibrar la carga de escrituras de consola\"), dicho bloqueo se puede prevenir usando printk_deferred() en kmalloc() (que se invoca en la secci\u00f3n protegida por port-&gt;lock). Pero hay demasiados printk() en la ruta kmalloc() y kmalloc() se puede llamar desde cualquier lugar, por lo que cambiar printk() a printk_deferred() es demasiado complicado y poco elegante. Por lo tanto, este parche elige especificar __GFP_NOWARN en kmalloc(), de modo que no se llame a printk() y se pueda evitar este problema de bloqueo. Syzbot inform\u00f3 el siguiente error de lockdep: ======================================================== ADVERTENCIA: posible dependencia de bloqueo circular detectada 5.4.143-00237-g08ccc19a-dirty #10 Not tainted ------------------------------------------------------ syz-executor.4/29420 is trying to acquire lock: ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline] ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023 but task is already holding lock: ffff8880119c9158 (&amp;port-&gt;lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -&gt; #2 (&amp;port-&gt;lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159 tty_port_tty_get drivers/tty/tty_port.c:288 [inline] &lt;-- lock(&amp;port-&gt;lock); tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47 serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767 serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] &lt;-- lock(&amp;port_lock_key); serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870 serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156 [...] -&gt; #1 (&amp;port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159 serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198 &lt;-- lock(&amp;port_lock_key); call_console_drivers kernel/printk/printk.c:1819 [inline] console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504 vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024 &lt;-- lock(console_owner); vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394 printk+0xba/0xed kernel/printk/printk.c:2084 register_console+0x8b3/0xc10 kernel/printk/printk.c:2829 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681 console_init+0x49d/0x6d3 kernel/printk/printk.c:2915 start_kernel+0x5e9/0x879 init/main.c:713 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 -&gt; #0 (console_owner){....}-{0:0}: [...] lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734 console_trylock_spinning kernel/printk/printk.c:1773 ---truncated--- "}], "id": "CVE-2022-49441", "lastModified": "2025-03-17T16:53:58.013", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-02-26T07:01:20.523", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04ee31678c128a6cc7bb057ea189a8624ba5a314"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bcf44903ef4df742dcada86ccaedd25374ffb50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18ca0d55e8639b911df8aae1b47598b13f9acded"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3219ac364ac3d8d30771612a6010f1e0b7fa0a28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4af21b12a60ed2d3642284f4f85b42d7dc6ac246"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c253caf9264d2aa47ee806a87986dd8eb91a5d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6b9dbedbe3499fef862c4dff5217cf91f34e43b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9834b13e8b962caa28fbcf1f422dd82413da4ede"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3c974501d0c32258ae0e04e5cc3fb92383b40f6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tty: fix deadlock caused by calling printk() under tty_port->lock", "id": "2348057", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348057"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntty: fix deadlock caused by calling printk() under tty_port->lock\npty_write() invokes kmalloc() which may invoke a normal printk() to print\nfailure message. This can cause a deadlock in the scenario reported by\nsyz-bot below:\nCPU0 CPU1 CPU2\n---- ---- ----\nlock(console_owner);\nlock(&port_lock_key);\nlock(&port->lock);\nlock(&port_lock_key);\nlock(&port->lock);\nlock(console_owner);\nAs commit dbdda842fe96 (\"printk: Add console owner and waiter logic to\nload balance console writes\") said, such deadlock can be prevented by\nusing printk_deferred() in kmalloc() (which is invoked in the section\nguarded by the port->lock). But there are too many printk() on the\nkmalloc() path, and kmalloc() can be called from anywhere, so changing\nprintk() to printk_deferred() is too complicated and inelegant.\nTherefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so\nthat printk() will not be called, and this deadlock problem can be\navoided.\nSyzbot reported the following lockdep error:\n======================================================\nWARNING: possible circular locking dependency detected\n5.4.143-00237-g08ccc19a-dirty #10 Not tainted\n------------------------------------------------------\nsyz-executor.4/29420 is trying to acquire lock:\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752 [inline]\nffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023\nbut task is already holding lock:\nffff8880119c9158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120\nwhich lock already depends on the new lock.\nthe existing dependency chain (in reverse order) is:\n-> #2 (&port->lock){-.-.}-{2:2}:\n__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n_raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\ntty_port_tty_get drivers/tty/tty_port.c:288 [inline] <-- lock(&port->lock);\ntty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47\nserial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767\nserial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854\nserial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline] <-- lock(&port_lock_key);\nserial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870\nserial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126\n__handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156\n[...]\n-> #1 (&port_lock_key){-.-.}-{2:2}:\n__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n_raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159\nserial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198\n<-- lock(&port_lock_key);\ncall_console_drivers kernel/printk/printk.c:1819 [inline]\nconsole_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504\nvprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024<-- lock(console_owner);\nvprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394\nprintk+0xba/0xed kernel/printk/printk.c:2084\nregister_console+0x8b3/0xc10 kernel/printk/printk.c:2829\nuniv8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681\nconsole_init+0x49d/0x6d3 kernel/printk/printk.c:2915\nstart_kernel+0x5e9/0x879 init/main.c:713\nsecondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241\n-> #0 (console_owner){....}-{0:0}:\n[...]\nlock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734\nconsole_trylock_spinning kernel/printk/printk.c:1773 \n---truncated---"], "name": "CVE-2022-49441", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49441\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49441\nhttps://lore.kernel.org/linux-cve-announce/2025022657-CVE-2022-49441-8b58@gregkh/T"], "threat_severity": "Moderate"}