{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "06377c54a133621d61fa76cdcea85077c5b958f4"
            },
            {
              "fixed": "8c4f27a7f364eab514d2fa55c11f39d505122f1b"
            },
            {
              "fixed": "08326b92c7a414a73b5b308d1daf0e91e0134dfc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80639.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/test: Fix __fortify_panic\n\nFix a runtime assertion in setup_xor_mapping(). Fortify complains that it\nis potentially overflowing the xormaps array per __counted_by(nr_maps).\nQuiet the false positive by initializing @nr_maps earlier.\n\n memcpy: detected buffer overflow: 32 byte write of buffer size 0\n WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#8: modprobe/2728\n Call Trace:\n  __fortify_panic+0xd/0xf\n  setup_xor_mapping+0x6c/0xa0 [cxl_translate]\n\n[ dj: Fixed up @nr_entries to @nr_maps in commit log. ]",
  "id": "CVE-2026-80639",
  "modified": "2026-08-30T03:30:48.394642226Z",
  "published": "2026-08-28T06:48:52.045Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08326b92c7a414a73b5b308d1daf0e91e0134dfc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c4f27a7f364eab514d2fa55c11f39d505122f1b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80639.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80639"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "cxl/test: Fix __fortify_panic"
}