CVE-2026-99243: Linux kernel · io-wq: order the exit bit against worker creation task work
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in a63c752157eacf49f628359822666b32503d194a : update Linux kernel when convenient.
Data as of 3 Nov 2026, 11:43 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in a63c752157eacf49f628359822666b32503d194a, 75395db7a9b40a2e826c838e648fef8ed1a2d174, 1432d881d99584105122760133caeff1dce7a9f7 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in Linux kernel versions 5.15.224 and later, as well as in version 5.16. Users should update to these fixed versions to remediate the issue.
Description
A concurrency issue in the Linux kernel's io-wq subsystem was addressed by ensuring proper memory ordering when setting the exit bit against worker creation task work. Without this ordering, on weakly ordered architectures, the exiting task could indefinitely wait due to a race condition involving task work cancellation and worker references.
References
- git.kernel.org/stable/c/67da3eec264aeb67835886720243ae2dc1463315 (opens in a new tab)
- git.kernel.org/stable/c/a63c752157eacf49f628359822666b32503d194a (opens in a new tab)
- git.kernel.org/stable/c/1432d881d99584105122760133caeff1dce7a9f7 (opens in a new tab)
- git.kernel.org/stable/c/6cf012a4d5e461c788ecc9dbed67adc31a142644 (opens in a new tab)
- git.kernel.org/stable/c/0d81cdd433b0a96c5275c01b8172e0b1f71dd595 (opens in a new tab)
- git.kernel.org/stable/c/75395db7a9b40a2e826c838e648fef8ed1a2d174 (opens in a new tab)
- git.kernel.org/stable/c/31fc780b75b278d37700373d54a99fdb4117fdd6 (opens in a new tab)