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GHSA-4G2W-HPR2-F26J

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80891"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T18:17:57Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Validate AIBV and AISB before pinning guest pages\n\nThe AIBV holds one bit per MSI-X vector for a given function. The size of\nthe bit vector is derived from the NOI and the AIBVO. If the size of the\nAIBV exceeds a single page boundary, then reject the request as we cannot\nsafely pin the guest AIBV.\n\nSimilarly reject the request if the AISB address is not 8-byte aligned as\nthe architecture requires doubleword alignment for the summary bit address.\nSince the AISBO can address up to 64 bits, the size of the AISB can only be\n8 bytes for the function. This also ensures the AISB doesn\u0027t exceed a\nsingle page boundary.",
  "id": "GHSA-4g2w-hpr2-f26j",
  "modified": "2026-09-04T18:31:33Z",
  "published": "2026-09-04T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80891"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b878ba7e28144c9a857bc847d31f3c45413450ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f00ef8efd41440129ccd88f4a1ebebf8d61d297f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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