CVE-2026-43329
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: flowtable: strictly check for maximum number of actions
The maximum number of flowtable hardware offload actions in IPv6 is:
* ethernet mangling (4 payload actions, 2 for each ethernet address) * SNAT (4 payload actions) * DNAT (4 payload actions) * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ. * Redirect (1 action)
Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions.
Leer descripción completaMostrar menos
Update flow_action_entry_next() calls to check for the maximum number of supported actions.
While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- 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 escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact70 % - Impacto secundario
T1565.001Stored Data Manipulationimpact55 %
AV:L PR:L permite escalada local; CWE-770 (asignación excesiva) puede causar DoS o corrupción. El kernel falla al validar límites de acciones netfilter flowtable.
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
- NVD-CWE-noinfo
- CWE-770
Referencias
- https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877
- https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc
- https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e
- https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893
- https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e
- https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614
- https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:26427
- https://access.redhat.com/errata/RHSA-2026:26428
- https://access.redhat.com/errata/RHSA-2026:27713
- https://access.redhat.com/errata/RHSA-2026:30848
- https://access.redhat.com/errata/RHSA-2026:33215
- https://access.redhat.com/errata/RHSA-2026:33899
- https://access.redhat.com/errata/RHSA-2026:33900
- https://access.redhat.com/errata/RHSA-2026:34094
- https://access.redhat.com/errata/RHSA-2026:34095
- https://access.redhat.com/errata/RHSA-2026:35863
- https://access.redhat.com/errata/RHSA-2026:35896
- https://access.redhat.com/errata/RHSA-2026:40764
- https://access.redhat.com/errata/RHSA-2026:43252
- https://access.redhat.com/errata/RHSA-2026:44230
- https://access.redhat.com/errata/RHSA-2026:44231
- https://access.redhat.com/errata/RHSA-2026:44259
- https://access.redhat.com/errata/RHSA-2026:44262
- https://access.redhat.com/errata/RHSA-2026:47702
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/errata/RHSA-2026:54187
- https://access.redhat.com/errata/RHSA-2026:55618
- https://access.redhat.com/errata/RHSA-2026:55761
- https://access.redhat.com/errata/RHSA-2026:55762
- https://access.redhat.com/errata/RHSA-2026:55763
- https://access.redhat.com/errata/RHSA-2026:55837
- https://access.redhat.com/errata/RHSA-2026:56224
- https://access.redhat.com/errata/RHSA-2026:56225
- https://access.redhat.com/errata/RHSA-2026:56853
- https://access.redhat.com/errata/RHSA-2026:56911
- https://access.redhat.com/security/cve/CVE-2026-43329
- https://bugzilla.redhat.com/show_bug.cgi?id=2468124
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json
JSON original (NVD)
Mostrar
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