CVE-2026-23269 (GCVE-0-2026-23269)
Vulnerability from cvelistv5
Published
2026-03-18 17:54
Modified
2026-04-18 08:57
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read. ================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ... Reject policies with out-of-bounds start states during unpacking to prevent the issue.
References
Impacted products
Vendor Product Version
Linux Linux Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
Version: ad5ff3db53c68c2f12936bc74ea5dfe0af943592
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/apparmor/policy_unpack.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.4"
            },
            {
              "lessThan": "3.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
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            },
            {
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              "version": "5.15.203",
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            },
            {
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              "status": "unaffected",
              "version": "6.1.169",
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            },
            {
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            },
            {
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              "version": "6.12.77",
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            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.18",
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            },
            {
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              "status": "unaffected",
              "version": "6.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: validate DFA start states are in bounds in unpack_pdb\n\nStart states are read from untrusted data and used as indexes into the\nDFA state tables. The aa_dfa_next() function call in unpack_pdb() will\naccess dfa-\u003etables[YYTD_ID_BASE][start], and if the start state exceeds\nthe number of states in the DFA, this results in an out-of-bound read.\n\n==================================================================\n BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360\n Read of size 4 at addr ffff88811956fb90 by task su/1097\n ...\n\nReject policies with out-of-bounds start states during unpacking\nto prevent the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:57:29.535Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19"
        },
        {
          "url": "https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df"
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        {
          "url": "https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a"
        },
        {
          "url": "https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da"
        },
        {
          "url": "https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184"
        },
        {
          "url": "https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816"
        },
        {
          "url": "https://www.qualys.com/2026/03/10/crack-armor.txt"
        }
      ],
      "title": "apparmor: validate DFA start states are in bounds in unpack_pdb",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23269",
    "datePublished": "2026-03-18T17:54:42.988Z",
    "dateReserved": "2026-01-13T15:37:45.991Z",
    "dateUpdated": "2026-04-18T08:57:29.535Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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