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CVE-2026-99203VulnerabilityPublished

Microsoft · pipe: preserve existing fasync readers on writer setup failure

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99203· High

Not known to be exploited · fixed in 2259809e5b7043c4ba20af7b14ba3e471cf55521 : patch Microsoft soon.

Data as of 29 Oct 2026, 11:33 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 2259809e5b7043c4ba20af7b14ba3e471cf55521, 40bb03d3ea6f6a915218508819ecc4d7a7fa260d, 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 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 29 Oct 2026.

What to do

Upgrade Linux to 2259809e5b7043c4ba20af7b14ba3e471cf55521, 40bb03d3ea6f6a915218508819ecc4d7a7fa260d or 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 76398425bb06b07cc3a3b1ce169c67dc9d6874ed, < 2259809e5b7043c4ba20af7b14ba3e471cf55521
Fixed in
  • 2259809e5b7043c4ba20af7b14ba3e471cf55521
LinuxLinuxAffected
  • ≥ 76398425bb06b07cc3a3b1ce169c67dc9d6874ed, < 40bb03d3ea6f6a915218508819ecc4d7a7fa260d
Fixed in
  • 40bb03d3ea6f6a915218508819ecc4d7a7fa260d
LinuxLinuxAffected
  • ≥ 76398425bb06b07cc3a3b1ce169c67dc9d6874ed, < 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa
Fixed in
  • 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa
LinuxLinuxAffected
  • =2.6.30
Fixed in–

Description

CVE-2026-99203 is a vulnerability related to the handling of asynchronous readers in a pipe mechanism within Microsoft software version 3.0. The description and details are minimal, with no CVSS score or detailed impact information provided.

References

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