Microsoft · s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in 647916988272fe5ecb4bb30cd02b51af9960618a : patch Microsoft soon.
Data as of 7 Nov 2026, 13:47 UTC
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
Disclosed: evidence found.
CVE published 16 Sep 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 7 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | 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
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.