CVE-2026-64411
Estado: ModificadaAlta (7.1)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ebtables: terminate table name before find_table_lock()
update_counters() and compat_update_counters() forward a user-supplied 32-byte table name to find_table_lock() without NUL-terminating it. On a lookup miss, find_inlist_lock() calls try_then_request_module(..., "%s%s", "ebtable_", name), and vsnprintf() reads past the name field and the stack object until it hits a zero byte.
compat_do_replace() shares the same unterminated name via compat_copy_ebt_replace_from_user(); terminate it there too so all find_table_lock() callers behave alike. The other callers already terminate the name after the copy.
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730) Read of size 1 at addr ffff8880119dfb20 by task exploit/147 Call Trace: ... string (lib/vsprintf.c:648 lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) __request_module (kernel/module/kmod.c:150) do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380) update_counters (net/bridge/netfilter/ebtables.c:1440) do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573) nf_setsockopt (net/netfilter/nf_sockopt.c:101) ip_setsockopt (net/ipv4/ip_sockglue.c:1424) raw_setsockopt (net/ipv4/raw.c:847) __sys_setsockopt (net/socket.c:2393) ...
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: 5/10/2026
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
T1059Command and Scripting Interpreterexecution70 % - Impacto secundario
T1499.004Application or System Exploitationimpact65 %
AV:L + PR:L + acceso local con privilegios: T1068. Stack-out-of-bounds permite lectura de memoria y potencial ejecución de código o DoS (KASAN detects memory safety issues).
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/2664f537ca5bcb2ef3fac2683dcca602e51fad24
- https://git.kernel.org/stable/c/4c046ca4e35a83ea32f6e748f54139f5fe2a1d01
- https://git.kernel.org/stable/c/6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322
- https://git.kernel.org/stable/c/7436da6c1bc44654b7f11a17e746f6999fd37250
- https://git.kernel.org/stable/c/a622d2e9608c9dff47fc2e5759ac7aa3a836b45d
- https://git.kernel.org/stable/c/ab63ccefb9c71627f957a0724c2b9ebc869c6f20
- https://git.kernel.org/stable/c/b6183b1b88a722b6d8ea0cecc99eba168a15e0be
- https://git.kernel.org/stable/c/c6f539311e58e76aa96feef0f1572b13a564f8a2
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: terminate table name before find_table_lock()\n\nupdate_counters() and compat_update_counters() forward a user-supplied\n32-byte table name to find_table_lock() without NUL-terminating it. On a\nlookup miss, find_inlist_lock() calls try_then_request_module(..., \"%s%s\",\n\"ebtable_\", name), and vsnprintf() reads past the name field and the\nstack object until it hits a zero byte.\n\n BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730)\n Read of size 1 at addr ffff8880119dfb20 by task exploit/147\n Call Trace:\n ...\n string (lib/vsprintf.c:648 lib/vsprintf.c:730)\n vsnprintf (lib/vsprintf.c:2945)\n __request_module (kernel/module/kmod.c:150)\n do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380)\n update_counters (net/bridge/netfilter/ebtables.c:1440)\n do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573)\n nf_setsockopt (net/netfilter/nf_sockopt.c:101)\n ip_setsockopt (net/ipv4/ip_sockglue.c:1424)\n raw_setsockopt (net/ipv4/raw.c:847)\n __sys_setsockopt (net/socket.c:2393)\n ...\n\ncompat_do_replace() shares the same unterminated name via\ncompat_copy_ebt_replace_from_user(); terminate it there too so all\nfind_table_lock() callers behave alike. The other callers already\nterminate the name after the copy."
}
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