Microsoft · pipe: preserve existing fasync readers on writer setup failure
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in 2259809e5b7043c4ba20af7b14ba3e471cf55521 : patch Microsoft soon.
Data as of 29 Oct 2026, 11:33 UTC
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
Disclosed: evidence found.
CVE published 28 Oct 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 29 Oct 2026.
What to do
Upgrade Linux to 2259809e5b7043c4ba20af7b14ba3e471cf55521, 40bb03d3ea6f6a915218508819ecc4d7a7fa260d or 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| 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.