CVE-2026-80891
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Validate AIBV and AISB before pinning guest pages The AIBV holds one bit per MSI-X vector for a given function. The size of the bit vector is derived from the NOI and the AIBVO. If the size of the AIBV exceeds a single page boundary, then reject the request as we cannot safely pin the guest AIBV. Similarly reject the request if the AISB address is not 8-byte aligned as the architecture requires doubleword alignment for the summary bit address. Since the AISBO can address up to 64 bits, the size of the AISB can only be 8 bytes for the function. This also ensures the AISB doesn't exceed a single page boundary.
Affected versions
Linux kernel versions
6.0
and later are affected. Fixed in
6.1.183,
6.6.151,
6.12.103,
6.18.44,
7.1.8,
7.2
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-80891?
CVE-2026-80891 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.0 onward and has been patched in 6.1.183, 6.6.151, 6.12.103 and others. CVE-2026-80891 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80891?
Yes. CVE-2026-80891 has been patched. Fixed versions include 6.1.183, 6.6.151, 6.12.103 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80891 actively exploited?
No. CVE-2026-80891 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.