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CVE-2026-80920VulnerabilityPublished Updated

Microsoft · io_uring: defer eventfd signaling when queued from a wakeup handler

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-80920· Medium

Not known to be exploited · fixed in e22f4494cc9487d326e5e3067f33dea7c1e442b2 : update Microsoft when convenient.

Data as of 7 Nov 2026, 12:19 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Patch
Available – fixed in e22f4494cc9487d326e5e3067f33dea7c1e442b2, d0c240f25e654442a72af5ca021a02165ccce638, cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Sep 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
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < e22f4494cc9487d326e5e3067f33dea7c1e442b2
Fixed in
  • e22f4494cc9487d326e5e3067f33dea7c1e442b2
LinuxLinuxAffected
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < d0c240f25e654442a72af5ca021a02165ccce638
Fixed in
  • d0c240f25e654442a72af5ca021a02165ccce638
LinuxLinuxAffected
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e
Fixed in
  • cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e
LinuxLinuxAffected
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f
Fixed in
  • b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f
LinuxLinuxAffected
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < 40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a
Fixed in
  • 40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a
LinuxLinuxAffected
  • ≥ 21a091b970cdbcf3e8ff829234b51be6f9192766, < 9d984451baf768ecd9e1fdad4637b729fcb2c9d5
Fixed in
  • 9d984451baf768ecd9e1fdad4637b729fcb2c9d5

Description

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

References

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