CVE-2026-64425
io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
July 25, 2026, 10:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64425
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel.
- Ensure kernel patches are applied.
- Verify io_uring work item handling.
- Confirm exit bit check covers linked items.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64425.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64425 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64425
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64425 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64425 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '065dd936195a3466b8ebe5f9287400987ee3c063', 'lessThan': '14b7ecad2ec56699325180a744f4b19f046401bb', 'versionType': 'git'}, {'status': 'affected', 'version': '27e47500fac23d15b7dc93ff650bc4844d2581bd', 'lessThan': 'd179533c610e1b4c6aa436e3c1fd1b719d2c727c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd05d99573f81a091547b1778b9a50120f5d6c68a', 'lessThan': '6e2f51f3e06773c2ee98ad09738f0908b48f76f9', 'versionType': 'git'}, {'status': 'affected', 'version': '85eb83694a91c89d9abe615d717c0053c3efa714', 'lessThan': 'ea61b04e1d7242cb37f5ed2cc91cf21a493f6597', 'versionType': 'git'}, {'status': 'affected', 'version': '2e8ca1078b14142db2ce51cbd18ff9971560046b', 'lessThan': 'b6f179a653a934736c88d820fe0098c3c2532549', 'versionType': 'git'}, {'status': 'affected', 'version': 'bdf0bf73006ea8af9327cdb85cfdff4c23a5f966', 'lessThan': '1636d85dc139b07c0449308f2bb5e0c7a2e0da99', 'versionType': 'git'}, {'status': 'affected', 'version': '10dc959398175736e495f71c771f8641e1ca1907', 'lessThan': 'ab85765cbe3258b43dc6729af0e6ce3a87a133d8', 'versionType': 'git'}, {'status': 'affected', 'version': '10dc959398175736e495f71c771f8641e1ca1907', 'lessThan': '29bef9934b2521f787bb15dd1985d4c0d12ae02a', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.253', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.203', 'lessThan': '5.15.212', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.1.167', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.122', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.68', 'lessThan': '6.12.96', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.8', 'lessThan': '6.18.39', 'versionType': 'semver'}], 'programFiles': ['io_uring/io-wq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['io_uring/io-wq.c'], 'defaultStatus': 'affected'}] 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. Added Reference https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb Added Reference https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99 Added Reference https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a Added Reference https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9 Added Reference https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8 Added Reference https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549 Added Reference https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c Added Reference https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597