CVE-2026-64425 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb
https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99
https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a
https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9
https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8
https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549
https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c
https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item commit 10dc95939817 ("io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop") fixed the obvious case where io_worker_handle_work() took one exit-bit snapshot before draining pending work, but the fix stops one level too early. io_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work run loop, yet it still snapshots that bit once before processing a whole dependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT after the first linked item has started, the remaining linked items can still reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue running after exit has begun. Move the check further inside, so it covers linked items too. Note: this is a syzbot special as it loves setting up tons of slow linked work on weird devices like msr that take forever to read, and immediately close the ring. Exit then takes a long time.
Title		io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99 https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9 https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8 https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549 https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64425", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.787Z", "datePublished": "2026-07-25T08:51:03.036Z", "dateUpdated": "2026-07-25T08:51:03.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:51:03.036Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item\n\ncommit 10dc95939817 (\"io_uring/io-wq: check IO_WQ_BIT_EXIT inside work\nrun loop\") fixed the obvious case where io_worker_handle_work() took one\nexit-bit snapshot before draining pending work, but the fix stops one\nlevel too early.\n\nio_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work\nrun loop, yet it still snapshots that bit once before processing a whole\ndependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT\nafter the first linked item has started, the remaining linked items can\nstill reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue\nrunning after exit has begun.\n\nMove the check further inside, so it covers linked items too. Note: this\nis a syzbot special as it loves setting up tons of slow linked work on\nweird devices like msr that take forever to read, and immediately close\nthe ring. Exit then takes a long time."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/io-wq.c"], "versions": [{"version": "065dd936195a3466b8ebe5f9287400987ee3c063", "lessThan": "14b7ecad2ec56699325180a744f4b19f046401bb", "status": "affected", "versionType": "git"}, {"version": "27e47500fac23d15b7dc93ff650bc4844d2581bd", "lessThan": "d179533c610e1b4c6aa436e3c1fd1b719d2c727c", "status": "affected", "versionType": "git"}, {"version": "d05d99573f81a091547b1778b9a50120f5d6c68a", "lessThan": "6e2f51f3e06773c2ee98ad09738f0908b48f76f9", "status": "affected", "versionType": "git"}, {"version": "85eb83694a91c89d9abe615d717c0053c3efa714", "lessThan": "ea61b04e1d7242cb37f5ed2cc91cf21a493f6597", "status": "affected", "versionType": "git"}, {"version": "2e8ca1078b14142db2ce51cbd18ff9971560046b", "lessThan": "b6f179a653a934736c88d820fe0098c3c2532549", "status": "affected", "versionType": "git"}, {"version": "bdf0bf73006ea8af9327cdb85cfdff4c23a5f966", "lessThan": "1636d85dc139b07c0449308f2bb5e0c7a2e0da99", "status": "affected", "versionType": "git"}, {"version": "10dc959398175736e495f71c771f8641e1ca1907", "lessThan": "ab85765cbe3258b43dc6729af0e6ce3a87a133d8", "status": "affected", "versionType": "git"}, {"version": "10dc959398175736e495f71c771f8641e1ca1907", "lessThan": "29bef9934b2521f787bb15dd1985d4c0d12ae02a", "status": "affected", "versionType": "git"}, {"version": "5.10.253", "lessThan": "5.10.261", "status": "affected", "versionType": "semver"}, {"version": "5.15.203", "lessThan": "5.15.212", "status": "affected", "versionType": "semver"}, {"version": "6.1.167", "lessThan": "6.1.178", "status": "affected", "versionType": "semver"}, {"version": "6.6.122", "lessThan": "6.6.145", "status": "affected", "versionType": "semver"}, {"version": "6.12.68", "lessThan": "6.12.96", "status": "affected", "versionType": "semver"}, {"version": "6.18.8", "lessThan": "6.18.39", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/io-wq.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "5.10.253", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.203", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.167", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.122", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": 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