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vuln-cve/data/2026/23xxx/CVE-2026-23269.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-23269",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-01-13T15:37:45.991Z",
"datePublished": "2026-03-18T17:54:42.988Z",
"dateUpdated": "2026-08-05T12:20:59.546Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:20:59.546Z"
},
"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->tables[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": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires writing to the local AppArmor policy interface at /sys/kernel/security/apparmor/.load, which is a local filesystem operation.\nAC:L - The attacker fully controls the crafted policy data containing the out-of-bounds start state values. No race condition or special conditions beyond the attacker's control are needed.\nPR:L - Loading AppArmor policy requires CAP_MAC_ADMIN, but since unprivileged_userns_apparmor_policy defaults to 1, an unprivileged local user can obtain this capability by creating a user namespace.\nUI:N - No user interaction is needed; the attacker can craft and load the malicious policy autonomously.\nS:U - The vulnerability operates within the kernel security scope; there is no crossing of a virtualization or sandbox boundary.\nC:H - The OOB read from slab memory uses an attacker-controlled offset (u32 start state) that is not bounded to a few bytes, allowing potential disclosure of arbitrary kernel heap data through cascading reads in match_char.\nI:N - This is strictly an out-of-bounds read vulnerability; there is no write primitive or direct data modification capability.\nA:H - The OOB slab read triggers a kernel crash/oops as confirmed by the KASAN report in the commit message, causing a denial of service."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"security/apparmor/policy_unpack.c"
],
"versions": [
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "f43eea8ae0102ea198da211ef7f5ce83725ecf19",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "5487871b2b56c19d26936ed6fdc62652b30941df",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "07cf6320f40ea2ccfad63728cff34ecb309d03da",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "0baadb0eece2c4d939db10d3c323b4652ac79a58",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "3bb7db43e32190c973d4019037cedb7895920184",
"status": "affected",
"versionType": "git"
},
{
"version": "ad5ff3db53c68c2f12936bc74ea5dfe0af943592",
"lessThan": "9063d7e2615f4a7ab321de6b520e23d370e58816",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"security/apparmor/policy_unpack.c"
],
"versions": [
{
"version": "3.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.4",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.253",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.203",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.169",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.130",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.77",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.18",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.8",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "5.10.253"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "5.15.203"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "6.1.169"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "6.6.130"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "6.12.77"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "6.18.18"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "6.19.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4",
"versionEndExcluding": "7.0"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19"
},
{
"url": "https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df"
},
{
"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"
}
}
}
}
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