CVE-2026-80891

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    CVE-2026-80891

    Published: 4 Sept 2026Last Modified: 6 Sept 2026

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

    Details: 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.

    References: https://git.kernel.org/stable/c/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47, https://git.kernel.org/stable/c/3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48, https://git.kernel.org/stable/c/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01, https://git.kernel.org/stable/c/b878ba7e28144c9a857bc847d31f3c45413450ac, https://git.kernel.org/stable/c/f00ef8efd41440129ccd88f4a1ebebf8d61d297f, https://git.kernel.org/stable/c/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80891.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80891, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc
    Fixed -3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-80891 | CVE-DB