xfs: fix UAF in xchk_btree_check_block_owner

{
  "id": "54c2ad9147a48ebf11c1270f44cba029e0d612f30427b1ea65d81f371fb9e707",
  "url": "https://osv.dev/vulnerability/CVE-2026-23223",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfs: fix UAF in xchk_btree_check_block_owner",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchk_btree_check_block_owner We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.",
    "evidence": "osv:CVE-2026-23223",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.72",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23223",
      "aliases": [
        "CVE-2026-23223"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ec793e690f801d97a7ae2a0d429fea1fee4d44aa"
                },
                {
                  "fixed": "1d411278dda293a507cb794db7d9ed3511c685c6"
                },
                {
                  "fixed": "ed82e7949f5cac3058f4100f3cd670531d41a266"
                },
                {
                  "fixed": "ba5264610423d9653aa36920520902d83841bcfd"
                },
                {
                  "fixed": "1c253e11225bc5167217897885b85093e17c2217"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23223.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.72"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23223.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.785895820Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217",
        "https://git.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6",
        "https://git.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfd",
        "https://git.kernel.org/stable/c/ed82e7949f5cac3058f4100f3cd670531d41a266",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23223.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23223",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23223.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23223",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489888,
  "published_at": "2026-02-18T14:53:26.603+00:00"
}