CVE-2023-52804 (GCVE-0-2023-52804)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:31 – Updated: 2026-08-05 09:11
VLAI
Title
fs/jfs: Add validity check for db_maxag and db_agpref
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Add validity check for db_maxag and db_agpref Both db_maxag and db_agpref are used as the index of the db_agfree array, but there is currently no validity check for db_maxag and db_agpref, which can lead to errors. The following is related bug reported by Syzbot: UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20 index 7936 is out of range for type 'atomic_t[128]' Add checking that the values of db_maxag and db_agpref are valid indexes for the db_agfree array.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:36 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a0649e2dd4a3595b5595a29d0064d047c2fae2fb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ce15b0f1a431168f07b1cc6c9f71206a2db5c809 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 32bd8f1cbcf8b663e29dd1f908ba3a129541a11b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c6c8863fb3f57700ab583d875adda04caaf2278a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1f74d336990f37703a8eee77153463d65b67f70e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5013f8269887642cca784adc8db9b5f0b771533f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dca403bb035a565bb98ecc1dda5d30f676feda40 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2323de34a3ae61a9f9b544c18583f71cea86721f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 64933ab7b04881c6c18b21ff206c12278341c72e (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.14.331 , ≤ 4.14.* (semver)
Unaffected: 4.19.300 , ≤ 4.19.* (semver)
Unaffected: 5.4.262 , ≤ 5.4.* (semver)
Unaffected: 5.10.202 , ≤ 5.10.* (semver)
Unaffected: 5.15.140 , ≤ 5.15.* (semver)
Unaffected: 6.1.64 , ≤ 6.1.* (semver)
Unaffected: 6.5.13 , ≤ 6.5.* (semver)
Unaffected: 6.6.3 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/jfs: Add validity check for db_maxag and db_agpref\n\nBoth db_maxag and db_agpref are used as the index of the\ndb_agfree array, but there is currently no validity check for\ndb_maxag and db_agpref, which can lead to errors.\n\nThe following is related bug reported by Syzbot:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20\nindex 7936 is out of range for type \u0027atomic_t[128]\u0027\n\nAdd checking that the values of db_maxag and db_agpref are valid\nindexes for the db_agfree array."
            }
          ],
          "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"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The bug is reached by mounting a crafted JFS block-device image (e.g. loop/USB) and then performing local filesystem operations; it is not reachable via remote packet parsing.\nAC:L - The attacker fully controls the on-disk bmap fields and can set db_agpref/db_maxag to out-of-range values that reliably trigger the OOB paths on subsequent allocations (e.g. symlink \u2192 dbAlloc \u2192 dbNextAG).\nPR:L - An unprivileged local user can supply a malicious JFS image and have it mounted via common low-privilege mount helpers (e.g. udisks), then trigger the bug with ordinary file-creating syscalls on that mount.\nUI:N - No separate victim action is required once the attacker can mount their own crafted image and exercise write paths such as symlink/create on it.\nS:U - Impact is confined to the local kernel/host authority (memory corruption / privilege escalation within the same system); it does not cross a VM, IOMMU, or other security boundary.\nC:H - Attacker-controlled indexes cause large out-of-bounds reads of kernel heap (db_active/db_agfree and related structures), which can disclose arbitrary adjacent memory.\nI:H - Out-of-range db_maxag drives OOB AG_LOCK/diAllocAG and related allocator updates past MAXAG-sized arrays, enabling heap corruption and control-flow/integrity compromise.\nA:H - The same OOB accesses reliably produce kernel UBSAN/KASAN failures and can oops/panic or otherwise crash the kernel."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:11:29.986Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/a0649e2dd4a3595b5595a29d0064d047c2fae2fb"
            },
            {
              "url": "https://git.kernel.org/stable/c/ce15b0f1a431168f07b1cc6c9f71206a2db5c809"
            },
            {
              "url": "https://git.kernel.org/stable/c/32bd8f1cbcf8b663e29dd1f908ba3a129541a11b"
            },
            {
              "url": "https://git.kernel.org/stable/c/c6c8863fb3f57700ab583d875adda04caaf2278a"
            },
            {
              "url": "https://git.kernel.org/stable/c/1f74d336990f37703a8eee77153463d65b67f70e"
            },
            {
              "url": "https://git.kernel.org/stable/c/5013f8269887642cca784adc8db9b5f0b771533f"
            },
            {
              "url": "https://git.kernel.org/stable/c/dca403bb035a565bb98ecc1dda5d30f676feda40"
            },
            {
              "url": "https://git.kernel.org/stable/c/2323de34a3ae61a9f9b544c18583f71cea86721f"
            },
            {
              "url": "https://git.kernel.org/stable/c/64933ab7b04881c6c18b21ff206c12278341c72e"
            }
          ],
          "title": "fs/jfs: Add validity check for db_maxag and db_agpref",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52804",
        "datePublished": "2024-05-21T15:31:15.720Z",
        "dateReserved": "2024-05-21T15:19:24.247Z",
        "dateUpdated": "2026-08-05T09:11:29.986Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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  • 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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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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