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Vulnerability record · CVE-2026-64425 · published 25 July 2026

CVE-2026-64425: Linux kernel vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.17% · top 94.8%
5.5CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb Patch
https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99 Patch
https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a Patch
https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9 Patch
https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8 Patch
https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549 Patch
https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c Patch
https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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Source: NIST National Vulnerability Database (record CVE-2026-64425), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.