CVE-2026-80891 is a vulnerability in Linux Kernel
Published on September 4, 2026
KVM: s390: pci: Validate AIBV and AISB before pinning guest pages
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.
Products Associated with CVE-2026-80891
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Affected Versions
Linux:- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48 is affected.
- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below f00ef8efd41440129ccd88f4a1ebebf8d61d297f is affected.
- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below 15df7700dd99f8a37f5c6ed2dcf1e33009cdba47 is affected.
- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below b878ba7e28144c9a857bc847d31f3c45413450ac is affected.
- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528 is affected.
- Version 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc and below 868d32ac72cba21c5c6d8a66a814b7c25a3a5c01 is affected.
- Version 6.0 is affected.
- Before 6.0 is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.