freevxfs: don't BUG() on unknown typed-extent type

{
  "id": "855cc02e4796ea5281b6b8f7f6b7e607db940d612ff224511cbd7fb58602e07c",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98872",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "freevxfs: don't BUG() on unknown typed-extent type",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: freevxfs: don't BUG() on unknown typed-extent type vxfs_bmap_typed() handles four typed-extent types and calls BUG() in its default case, so an on-disk typed extent with any other type value crashes the kernel. It is reachable from ioctl(FIBMAP) on a regular file: kernel BUG at fs/freevxfs/vxfs_bmap.c:230! RIP: vxfs_bmap_typed fs/freevxfs/vxfs_bmap.c:230 [inline] vxfs_bmap1+0x128a/0x12d0 fs/freevxfs/vxfs_bmap.c:257 Replace the BUG() with WARN_ON_ONCE() and return 0 -- the value vxfs_bmap_typed() already returns on failure (and from the DEV4 case above); vxfs_getblk() maps 0 to -EIO, so the ioctl fails cleanly.",
    "evidence": "cve:CVE-2026-98872",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98872",
      "aliases": [
        "CVE-2026-98872"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "fe40a19d571cbb584eea46038ee919d8712b2d2c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "500e9d5bf9eff2096a21b7ac25a0a06ca46ab821",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "f1f2d54a576f0e4133b979e545abcfefd439c300",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "7ada9807e37103b41f586d34e3075e1209182b65",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "1284d687d46953fff9c0d969df108114611aca8b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "405f13d7b270913e06e8e2b4de568985f94ef7d6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "704d48d81dc41470e108811c32c577ada66192d4",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/freevxfs/vxfs_bmap.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/freevxfs/vxfs_bmap.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:55:53.758Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/fe40a19d571cbb584eea46038ee919d8712b2d2c",
        "https://git.kernel.org/stable/c/500e9d5bf9eff2096a21b7ac25a0a06ca46ab821",
        "https://git.kernel.org/stable/c/f1f2d54a576f0e4133b979e545abcfefd439c300",
        "https://git.kernel.org/stable/c/7ada9807e37103b41f586d34e3075e1209182b65",
        "https://git.kernel.org/stable/c/1284d687d46953fff9c0d969df108114611aca8b",
        "https://git.kernel.org/stable/c/405f13d7b270913e06e8e2b4de568985f94ef7d6",
        "https://git.kernel.org/stable/c/704d48d81dc41470e108811c32c577ada66192d4"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:55:53.758Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98872",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263330,
  "published_at": "2026-10-23T11:37:11.214+00:00"
}