{ "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" } } } }