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CVE-2026-80891

KVM: s390: pci: Validate AIBV and AISB before pinning guest pages PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48; affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before f00ef8efd41440129ccd88f4a1ebebf8d61d297f; affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before 15df7700dd99f8a37f5c6ed2dcf1e33009cdba47; affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before b878ba7e28144c9a857bc847d31f3c45413450ac; affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528; affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc before 868d32ac72cba21c5c6d8a66a814b7c25a3a5c01
Linux / Linuxaffected 6.0; unaffected 0 before 6.0; unaffected 6.1.183 through 6.1.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.103 through 6.12.*; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References