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CVE-2026-99254VulnerabilityPublished Updated

Microsoft · io_uring: don't flood a cancelling task with task_work

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99254· Medium

Not known to be exploited · fixed in f334e79a11e084713e82402b1a7a0e321526992a : update Microsoft when convenient.

Data as of 7 Nov 2026, 12:18 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f334e79a11e084713e82402b1a7a0e321526992a, abdc57c7ebabaaf0b622178a6a85834e1e54ff80, a22fb44e988b01b82235ea07f0bf0fc73e256596 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < f334e79a11e084713e82402b1a7a0e321526992a
Fixed in
  • f334e79a11e084713e82402b1a7a0e321526992a
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < abdc57c7ebabaaf0b622178a6a85834e1e54ff80
Fixed in
  • abdc57c7ebabaaf0b622178a6a85834e1e54ff80
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < a22fb44e988b01b82235ea07f0bf0fc73e256596
Fixed in
  • a22fb44e988b01b82235ea07f0bf0fc73e256596
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < 61c761fc21e00e45c33c2bb596be442d92fb8792
Fixed in
  • 61c761fc21e00e45c33c2bb596be442d92fb8792
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < 22e643e61b9b6299b42ff7d88bab48bccada8a5d
Fixed in
  • 22e643e61b9b6299b42ff7d88bab48bccada8a5d
LinuxLinuxAffected
  • ≥ d56d938b4bef3e1421a42023cdcd6e13c1f50831, < 14f56e9c0b8fdc2e178acdbec9781e90ef46f7e9
Fixed in
  • 14f56e9c0b8fdc2e178acdbec9781e90ef46f7e9

Description

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

References

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