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CVE-2026-89956VulnerabilityPublished Updated

Microsoft · s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-89956· High

Not known to be exploited · fixed in 647916988272fe5ecb4bb30cd02b51af9960618a : patch Microsoft soon.

Data as of 7 Nov 2026, 13:47 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 647916988272fe5ecb4bb30cd02b51af9960618a, 530ee1cc71562b6799b9ece187b6c1b757a2c6fa, 22dc712c170efc1a549e3f872467c880be995ac7 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 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
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 647916988272fe5ecb4bb30cd02b51af9960618a
Fixed in
  • 647916988272fe5ecb4bb30cd02b51af9960618a
LinuxLinuxAffected
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 530ee1cc71562b6799b9ece187b6c1b757a2c6fa
Fixed in
  • 530ee1cc71562b6799b9ece187b6c1b757a2c6fa
LinuxLinuxAffected
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 22dc712c170efc1a549e3f872467c880be995ac7
Fixed in
  • 22dc712c170efc1a549e3f872467c880be995ac7
LinuxLinuxAffected
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 7fa61c29850d05e40ca9ed41bfdf57673023f581
Fixed in
  • 7fa61c29850d05e40ca9ed41bfdf57673023f581
LinuxLinuxAffected
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 3ea443510739468238324234eaab0d37922283f5
Fixed in
  • 3ea443510739468238324234eaab0d37922283f5
LinuxLinuxAffected
  • ≥ 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a, < 0fd74477d05743d4cd9b25a3b667daa278d53b93
Fixed in
  • 0fd74477d05743d4cd9b25a3b667daa278d53b93

Description

A vulnerability identified as CVE-2026-89956 affects Microsoft products versions 3.0 and 4.0. It involves a missing lock required to safely access the list of ap_matrix_mdev objects in the s390/vfio-ap component. The issue has been published but lacks detailed impact or exploit information.

References

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