CVE-2026-80891

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48affected
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < f00ef8efd41440129ccd88f4a1ebebf8d61d297faffected
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < 15df7700dd99f8a37f5c6ed2dcf1e33009cdba47affected
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < b878ba7e28144c9a857bc847d31f3c45413450acaffected
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528affected
LinuxLinux3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc < 868d32ac72cba21c5c6d8a66a814b7c25a3a5c01affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References