CVE-2026-23224 (GCVE-0-2026-23224)

Vulnerability from cvelistv5 – Published: 2026-02-18 14:53 – Updated: 2026-05-11 22:02
VLAI
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_accessed : access NULL file point Introduce a reference count in struct erofs_fileio_rq, and initialize it as two, both erofs_fileio_ki_complete() and erofs_fileio_rq_submit() will decrease reference count, the last one decreasing the reference count to zero will free rq.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fb176750266a3d7f42ebdcf28e8ba40350b27847 , < ae385826840a3c8e09bf38cac90adcd690716f57 (git)
Affected: fb176750266a3d7f42ebdcf28e8ba40350b27847 , < d741534302f71c511eb0bb670b92eaa7df4a0aec (git)
Affected: fb176750266a3d7f42ebdcf28e8ba40350b27847 , < b2ee5e4d5446babd23ff7beb4e636be0fb3ea5aa (git)
Affected: fb176750266a3d7f42ebdcf28e8ba40350b27847 , < 1caf50ce4af096d0280d59a31abdd85703cd995c (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.72 , ≤ 6.12.* (semver)
Unaffected: 6.18.11 , ≤ 6.18.* (semver)
Unaffected: 6.19.1 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/fileio.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.1",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionEndExcluding": "6.12.72",
                  "versionStartIncluding": "6.12",
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                },
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                },
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix UAF issue for file-backed mounts w/ directio option\n\n[    9.269940][ T3222] Call trace:\n[    9.269948][ T3222]  ext4_file_read_iter+0xac/0x108\n[    9.269979][ T3222]  vfs_iocb_iter_read+0xac/0x198\n[    9.269993][ T3222]  erofs_fileio_rq_submit+0x12c/0x180\n[    9.270008][ T3222]  erofs_fileio_submit_bio+0x14/0x24\n[    9.270030][ T3222]  z_erofs_runqueue+0x834/0x8ac\n[    9.270054][ T3222]  z_erofs_read_folio+0x120/0x220\n[    9.270083][ T3222]  filemap_read_folio+0x60/0x120\n[    9.270102][ T3222]  filemap_fault+0xcac/0x1060\n[    9.270119][ T3222]  do_pte_missing+0x2d8/0x1554\n[    9.270131][ T3222]  handle_mm_fault+0x5ec/0x70c\n[    9.270142][ T3222]  do_page_fault+0x178/0x88c\n[    9.270167][ T3222]  do_translation_fault+0x38/0x54\n[    9.270183][ T3222]  do_mem_abort+0x54/0xac\n[    9.270208][ T3222]  el0_da+0x44/0x7c\n[    9.270227][ T3222]  el0t_64_sync_handler+0x5c/0xf4\n[    9.270253][ T3222]  el0t_64_sync+0x1bc/0x1c0\n\nEROFS may encounter above panic when enabling file-backed mount w/\ndirectio mount option, the root cause is it may suffer UAF in below\nrace condition:\n\n- z_erofs_read_folio                          wq s_dio_done_wq\n - z_erofs_runqueue\n  - erofs_fileio_submit_bio\n   - erofs_fileio_rq_submit\n    - vfs_iocb_iter_read\n     - ext4_file_read_iter\n      - ext4_dio_read_iter\n       - iomap_dio_rw\n       : bio was submitted and return -EIOCBQUEUED\n                                              - dio_aio_complete_work\n                                               - dio_complete\n                                                - dio-\u003eiocb-\u003eki_complete (erofs_fileio_ki_complete())\n                                                 - kfree(rq)\n                                                 : it frees iocb, iocb.ki_filp can be UAF in file_accessed().\n       - file_accessed\n       : access NULL file point\n\nIntroduce a reference count in struct erofs_fileio_rq, and initialize it\nas two, both erofs_fileio_ki_complete() and erofs_fileio_rq_submit() will\ndecrease reference count, the last one decreasing the reference count\nto zero will free rq."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:02:43.408Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae385826840a3c8e09bf38cac90adcd690716f57"
        },
        {
          "url": "https://git.kernel.org/stable/c/d741534302f71c511eb0bb670b92eaa7df4a0aec"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2ee5e4d5446babd23ff7beb4e636be0fb3ea5aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/1caf50ce4af096d0280d59a31abdd85703cd995c"
        }
      ],
      "title": "erofs: fix UAF issue for file-backed mounts w/ directio option",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23224",
    "datePublished": "2026-02-18T14:53:27.462Z",
    "dateReserved": "2026-01-13T15:37:45.987Z",
    "dateUpdated": "2026-05-11T22:02:43.408Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-23224",
      "date": "2026-06-11",
      "epss": "0.00018",
      "percentile": "0.04847"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23224\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-18T16:22:32.143\",\"lastModified\":\"2026-04-02T15:16:23.573\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nerofs: fix UAF issue for file-backed mounts w/ directio option\\n\\n[    9.269940][ T3222] Call trace:\\n[    9.269948][ T3222]  ext4_file_read_iter+0xac/0x108\\n[    9.269979][ T3222]  vfs_iocb_iter_read+0xac/0x198\\n[    9.269993][ T3222]  erofs_fileio_rq_submit+0x12c/0x180\\n[    9.270008][ T3222]  erofs_fileio_submit_bio+0x14/0x24\\n[    9.270030][ T3222]  z_erofs_runqueue+0x834/0x8ac\\n[    9.270054][ T3222]  z_erofs_read_folio+0x120/0x220\\n[    9.270083][ T3222]  filemap_read_folio+0x60/0x120\\n[    9.270102][ T3222]  filemap_fault+0xcac/0x1060\\n[    9.270119][ T3222]  do_pte_missing+0x2d8/0x1554\\n[    9.270131][ T3222]  handle_mm_fault+0x5ec/0x70c\\n[    9.270142][ T3222]  do_page_fault+0x178/0x88c\\n[    9.270167][ T3222]  do_translation_fault+0x38/0x54\\n[    9.270183][ T3222]  do_mem_abort+0x54/0xac\\n[    9.270208][ T3222]  el0_da+0x44/0x7c\\n[    9.270227][ T3222]  el0t_64_sync_handler+0x5c/0xf4\\n[    9.270253][ T3222]  el0t_64_sync+0x1bc/0x1c0\\n\\nEROFS may encounter above panic when enabling file-backed mount w/\\ndirectio mount option, the root cause is it may suffer UAF in below\\nrace condition:\\n\\n- z_erofs_read_folio                          wq s_dio_done_wq\\n - z_erofs_runqueue\\n  - erofs_fileio_submit_bio\\n   - erofs_fileio_rq_submit\\n    - vfs_iocb_iter_read\\n     - ext4_file_read_iter\\n      - ext4_dio_read_iter\\n       - iomap_dio_rw\\n       : bio was submitted and return -EIOCBQUEUED\\n                                              - dio_aio_complete_work\\n                                               - dio_complete\\n                                                - dio-\u003eiocb-\u003eki_complete (erofs_fileio_ki_complete())\\n                                                 - kfree(rq)\\n                                                 : it frees iocb, iocb.ki_filp can be UAF in file_accessed().\\n       - file_accessed\\n       : access NULL file point\\n\\nIntroduce a reference count in struct erofs_fileio_rq, and initialize it\\nas two, both erofs_fileio_ki_complete() and erofs_fileio_rq_submit() will\\ndecrease reference count, the last one decreasing the reference count\\nto zero will free rq.\"},{\"lang\":\"es\",\"value\":\"Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\\n\\nerofs: soluciona un problema de UAF para montajes respaldados por archivos con la opci\u00f3n \u0027directio\u0027\\n\\n[    9.269940][ T3222] Rastreo de llamadas:\\n[    9.269948][ T3222]  ext4_file_read_iter+0xac/0x108\\n[    9.269979][ T3222]  vfs_iocb_iter_read+0xac/0x198\\n[    9.269993][ T3222]  erofs_fileio_rq_submit+0x12c/0x180\\n[    9.270008][ T3222]  erofs_fileio_submit_bio+0x14/0x24\\n[    9.270030][ T3222]  z_erofs_runqueue+0x834/0x8ac\\n[    9.270054][ T3222]  z_erofs_read_folio+0x120/0x220\\n[    9.270083][ T3222]  filemap_read_folio+0x60/0x120\\n[    9.270102][ T3222]  filemap_fault+0xcac/0x1060\\n[    9.270119][ T3222]  do_pte_missing+0x2d8/0x1554\\n[    9.270131][ T3222]  handle_mm_fault+0x5ec/0x70c\\n[    9.270142][ T3222]  do_page_fault+0x178/0x88c\\n[    9.270167][ T3222]  do_translation_fault+0x38/0x54\\n[    9.270183][ T3222]  do_mem_abort+0x54/0xac\\n[    9.270208][ T3222]  el0_da+0x44/0x7c\\n[    9.270227][ T3222]  el0t_64_sync_handler+0x5c/0xf4\\n[    9.270253][ T3222]  el0t_64_sync+0x1bc/0x1c0\\n\\nEROFS puede encontrar el p\u00e1nico anterior al habilitar el montaje respaldado por archivos con la opci\u00f3n de montaje directio; la causa ra\u00edz es que puede sufrir UAF en la siguiente condici\u00f3n de carrera:\\n\\n- z_erofs_read_folio                          wq s_dio_done_wq\\n - z_erofs_runqueue\\n  - erofs_fileio_submit_bio\\n   - erofs_fileio_rq_submit\\n    - vfs_iocb_iter_read\\n     - ext4_file_read_iter\\n      - ext4_dio_read_iter\\n       - iomap_dio_rw\\n       : bio fue enviado y devuelve -EIOCBQUEUED\\n                                              - dio_aio_complete_work\\n                                               - dio_complete\\n                                                - dio-\u0026gt;iocb-\u0026gt;ki_complete (erofs_fileio_ki_complete())\\n                                                 - kfree(rq)\\n                                                 : libera iocb, iocb.ki_filp puede ser UAF en file_accessed().\\n       - file_accessed\\n       : accede a un puntero de archivo NULL\\n\\nIntroducir un contador de referencias en la estructura erofs_fileio_rq, y lo inicializa a dos; tanto erofs_fileio_ki_complete() como erofs_fileio_rq_submit() disminuir\u00e1n el contador de referencias, el \u00faltimo en disminuir el contador de referencias a cero liberar\u00e1 rq.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.72\",\"matchCriteriaId\":\"6A704C39-CE3C-408D-9CE6-55B0E4AFCE28\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.11\",\"matchCriteriaId\":\"7099A9EC-3D54-4424-BF01-7224EF88C79C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.1\",\"matchCriteriaId\":\"EE543C0D-A06B-414F-A403-CB1E088F261E\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1caf50ce4af096d0280d59a31abdd85703cd995c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ae385826840a3c8e09bf38cac90adcd690716f57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b2ee5e4d5446babd23ff7beb4e636be0fb3ea5aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d741534302f71c511eb0bb670b92eaa7df4a0aec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.