CVE-2026-23269
Estado: AnalizadaAlta (7.1)—
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.
Reject policies with out-of-bounds start states during unpacking to prevent the issue.
Detalles técnicos trazas, registros y código del informe original
================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ...
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1005Data from Local Systemcollection75 %
Acceso local (AV:L) sin interacción (UI:N) con privilegios mínimos (PR:L) permite leer memoria fuera de límites (out-of-bounds read) en tablas DFA del kernel AppArmor.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-125
Referencias
- https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da
- https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58
- https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c
- https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184
- https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a
- https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df
- https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816
- https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19
- https://www.qualys.com/2026/03/10/crack-armor.txt
JSON original (NVD)
Mostrar
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"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."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\napparmor: validar que los estados iniciales de DFA están dentro de los límites en unpack_pdb\n\nLos estados iniciales se leen de datos no confiables y se usan como índices en las tablas de estados de DFA. La llamada a la función aa_dfa_next() en unpack_pdb() accederá a dfa->tables[YYTD_ID_BASE][start], y si el estado inicial excede el número de estados en el DFA, esto resulta en una lectura fuera de límites.\n\n==================================================================\nERROR: KASAN: slab-out-of-bounds en aa_dfa_next+0x2a1/0x360\nLectura de tamaño 4 en la dirección ffff88811956fb90 por la tarea su/1097\n...\n\nRechazar políticas con estados iniciales fuera de límites durante el desempaquetado para prevenir el problema."
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