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CVE-2026-93186VulnerabilityPublished Updated

Microsoft · cxl/mbox: Clamp mailbox output allocation to the payload size

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-93186· Medium

Not known to be exploited · fixed in f5d2bbf0300f46307948864fbb97bce5097f4fe2 : 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 f5d2bbf0300f46307948864fbb97bce5097f4fe2, d2d40574b9b272ade32d0d77b140d990e7547f5f, b4e11c731d6bee3b87315e055a1ca417c92dc1fc +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 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
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < f5d2bbf0300f46307948864fbb97bce5097f4fe2
Fixed in
  • f5d2bbf0300f46307948864fbb97bce5097f4fe2
LinuxLinuxAffected
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < d2d40574b9b272ade32d0d77b140d990e7547f5f
Fixed in
  • d2d40574b9b272ade32d0d77b140d990e7547f5f
LinuxLinuxAffected
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < b4e11c731d6bee3b87315e055a1ca417c92dc1fc
Fixed in
  • b4e11c731d6bee3b87315e055a1ca417c92dc1fc
LinuxLinuxAffected
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < 123f6d154253939ce38f0ec0b6d1ba67f870e01f
Fixed in
  • 123f6d154253939ce38f0ec0b6d1ba67f870e01f
LinuxLinuxAffected
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < 31d4841eca7c4b75751ca96d24339e19303337f2
Fixed in
  • 31d4841eca7c4b75751ca96d24339e19303337f2
LinuxLinuxAffected
  • ≥ 583fa5e71caeb79e04e477e9837e2f7fa53b71e4, < 8a13db9f899d149c3aab24abcb668121cfda5a4f
Fixed in
  • 8a13db9f899d149c3aab24abcb668121cfda5a4f

Description

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

References

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