{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74666", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.924Z", "datePublished": "2026-08-22T15:32:38.098Z", "dateUpdated": "2026-08-22T15:32:38.098Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:38.098Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: synchronize pressure clearing with ring reconfiguration\n\npacket_set_ring() updates the RX ring state under sk_receive_queue.lock,\nbut used to publish the tpacket receive mode through po->prot_hook.func\nafter releasing that lock. packet_poll() and packet_recvmsg() can then\nrun the pressure clearing path after the ring has been cleared while\nstill seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference\nstale or NULL ring storage.\n\nMove the existing receive hook assignment into the same\nsk_receive_queue.lock section as the ring state update. Keep the\nassignment otherwise unchanged, including on TX ring reconfiguration, to\navoid adding behavior changes that are not required for the fix.\n\nSerialize packet_recvmsg() pressure clearing with the same queue lock\nonly after PACKET_SOCK_PRESSURE has been observed. If the flag is clear\nand the socket has moved away from tpacket_rcv, packet_set_ring() has\nalready detached the socket and waited for synchronize_net(), so no new\npacket input can set the flag again.\n\npacket_poll() already holds sk_receive_queue.lock, so it uses the new\nunlocked helper directly."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/packet/af_packet.c"], "versions": [{"version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "lessThan": "cf8189b82bb93f219ab740e0346c919ad65ada62", "status": "affected", "versionType": "git"}, {"version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "lessThan": "ad740b4990347521f0db260d381f9f74e7b340ba", "status": "affected", "versionType": "git"}, {"version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "lessThan": "2c7b5eb87b2b288cdbde825f21d2b83b2f5da747", "status": "affected", "versionType": "git"}, {"version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "lessThan": "a08196c3cc105947746ec21309edfbb60275fcdb", "status": "affected", "versionType": "git"}, {"version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "lessThan": "1a35da325cac4d5bcad76a2aa943408a6f1d9000", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/packet/af_packet.c"], "versions": [{"version": "4.2", "status": "affected"}, {"version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62"}, {"url": "https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba"}, {"url": "https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"}, {"url": "https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb"}, {"url": "https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000"}], "title": "packet: synchronize pressure clearing with ring reconfiguration", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cf8189b82bb93f219ab740e0346c919ad65ada62", "status": "affected", "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "versionType": "git"}, {"lessThan": "ad740b4990347521f0db260d381f9f74e7b340ba", "status": "affected", "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "versionType": "git"}, {"lessThan": "2c7b5eb87b2b288cdbde825f21d2b83b2f5da747", "status": "affected", "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "versionType": "git"}, {"lessThan": "a08196c3cc105947746ec21309edfbb60275fcdb", "status": "affected", "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "versionType": "git"}, {"lessThan": "1a35da325cac4d5bcad76a2aa943408a6f1d9000", "status": "affected", "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"lessThan": "4.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: synchronize pressure clearing with ring reconfiguration\n\npacket_set_ring() updates the RX ring state under sk_receive_queue.lock,\nbut used to publish the tpacket receive mode through po->prot_hook.func\nafter releasing that lock. packet_poll() and packet_recvmsg() can then\nrun the pressure clearing path after the ring has been cleared while\nstill seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference\nstale or NULL ring storage.\n\nMove the existing receive hook assignment into the same\nsk_receive_queue.lock section as the ring state update. Keep the\nassignment otherwise unchanged, including on TX ring reconfiguration, to\navoid adding behavior changes that are not required for the fix.\n\nSerialize packet_recvmsg() pressure clearing with the same queue lock\nonly after PACKET_SOCK_PRESSURE has been observed. If the flag is clear\nand the socket has moved away from tpacket_rcv, packet_set_ring() has\nalready detached the socket and waited for synchronize_net(), so no new\npacket input can set the flag again.\n\npacket_poll() already holds sk_receive_queue.lock, so it uses the new\nunlocked helper directly."}], "id": "CVE-2026-74666", "lastModified": "2026-08-22T16:16:40.467", "metrics": {}, "published": "2026-08-22T16:16:40.467", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ccdbaa6d55b0656244ba57c4b56765a0af76c0a,cf8189b82bb93f219ab740e0346c919ad65ada62)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ccdbaa6d55b0656244ba57c4b56765a0af76c0a,ad740b4990347521f0db260d381f9f74e7b340ba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ccdbaa6d55b0656244ba57c4b56765a0af76c0a,2c7b5eb87b2b288cdbde825f21d2b83b2f5da747)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ccdbaa6d55b0656244ba57c4b56765a0af76c0a,a08196c3cc105947746ec21309edfbb60275fcdb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2ccdbaa6d55b0656244ba57c4b56765a0af76c0a,1a35da325cac4d5bcad76a2aa943408a6f1d9000)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T19:15:03.628033+00:00", "title": "Use-After-Free Race Condition Causing Kernel Crash in Linux Packet Socket", "updated": "2026-08-22T20:30:17.766049+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-362", "CWE-476"]}