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CVE-2026-99109VulnerabilityPublished

Microsoft · smb: client: reject SetEA requests that do not fit the request buffer

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99109· High

Not known to be exploited : upgrade to 9efbd764ab80fa86d2258550877a74d78a25e855 or 4aa2c106aef4bf3dfd97c30842db0767b26e8428 soon.

Data as of 29 Oct 2026, 12:03 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 9efbd764ab80fa86d2258550877a74d78a25e855, 4aa2c106aef4bf3dfd97c30842db0767b26e8428

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 9efbd764ab80fa86d2258550877a74d78a25e855 or 4aa2c106aef4bf3dfd97c30842db0767b26e8428.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9efbd764ab80fa86d2258550877a74d78a25e855
Fixed in
  • 9efbd764ab80fa86d2258550877a74d78a25e855
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4aa2c106aef4bf3dfd97c30842db0767b26e8428
Fixed in
  • 4aa2c106aef4bf3dfd97c30842db0767b26e8428
LinuxLinuxAffected
  • =2.6.12
Fixed in–

Description

This vulnerability involves the SMB client improperly handling SetEA requests that do not fit the request buffer. The issue is identified in Microsoft product version 3.0. No detailed impact or exploitation information is provided.

References

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