erofs: fix UAF issue for file-backed mounts w/ directio option

{
  "id": "8b19135f6bde8667f5112505c6b873c2ee86337177723d07d170770ec1b0ddb0",
  "url": "https://osv.dev/vulnerability/CVE-2026-23224",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "erofs: fix UAF issue for file-backed mounts w/ directio option",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: erofs: fix UAF issue for file-backed mounts w/ directio option [ 9.269940][ T3222] Call trace: [ 9.269948][ T3222] ext4_file_read_iter+0xac/0x108 [ 9.269979][ T3222] vfs_iocb_iter_read+0xac/0x198 [ 9.269993][ T3222] erofs_fileio_rq_submit+0x12c/0x180 [ 9.270008][ T3222] erofs_fileio_submit_bio+0x14/0x24 [ 9.270030][ T3222] z_erofs_runqueue+0x834/0x8ac [ 9.270054][ T3222] z_erofs_read_folio+0x120/0x220 [ 9.270083][ T3222] filemap_read_folio+0x60/0x120 [ 9.270102][ T3222] filemap_fault+0xcac/0x1060 [ 9.270119][ T3222] do_pte_missing+0x2d8/0x1554 [ 9.270131][ T3222] handle_mm_fault+0x5ec/0x70c [ 9.270142][ T3222] do_page_fault+0x178/0x88c [ 9.270167][ T3222] do_translation_fault+0x38/0x54 [ 9.270183][ T3222] do_mem_abort+0x54/0xac [ 9.270208][ T3222] el0_da+0x44/0x7c [ 9.270227][ T3222] el0t_64_sync_handler+0x5c/0xf4 [ 9.270253][ T3222] el0t_64_sync+0x1bc/0x1c0 EROFS may encounter above panic when enabling file-backed mount w/ directio mount option, the root cause is it may suffer UAF in below race condition: - z_erofs_read_folio wq s_dio_done_wq - z_erofs_runqueue - erofs_fileio_submit_bio - erofs_fileio_rq_submit - vfs_iocb_iter_read - ext4_file_read_iter - ext4_dio_read_iter - iomap_dio_rw : bio was submitted and return -EIOCBQUEUED - dio_aio_complete_work - dio_complete - dio->iocb->ki_complete (erofs_fileio_ki_complete()) - kfree(rq) : it frees iocb, iocb.ki_filp can be UAF in file_accessed(). - file_access",
    "evidence": "osv:CVE-2026-23224",
    "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": "high",
    "structured": {
      "id": "CVE-2026-23224",
      "aliases": [
        "CVE-2026-23224"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fb176750266a3d7f42ebdcf28e8ba40350b27847"
                },
                {
                  "fixed": "ae385826840a3c8e09bf38cac90adcd690716f57"
                },
                {
                  "fixed": "d741534302f71c511eb0bb670b92eaa7df4a0aec"
                },
                {
                  "fixed": "b2ee5e4d5446babd23ff7beb4e636be0fb3ea5aa"
                },
                {
                  "fixed": "1caf50ce4af096d0280d59a31abdd85703cd995c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23224.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "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-2026-23224.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.113275439Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1caf50ce4af096d0280d59a31abdd85703cd995c",
        "https://git.kernel.org/stable/c/ae385826840a3c8e09bf38cac90adcd690716f57",
        "https://git.kernel.org/stable/c/b2ee5e4d5446babd23ff7beb4e636be0fb3ea5aa",
        "https://git.kernel.org/stable/c/d741534302f71c511eb0bb670b92eaa7df4a0aec",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23224.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23224",
        "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-2026-23224.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23224",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500253,
  "published_at": "2026-02-18T14:53:27.462+00:00"
}