CVE-2026-43037
Estado: ModificadaCrítica (9.8)—
In the Linux kernel, the following vulnerability has been resolved:
ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
Oskar Kjos reported the following problem.
ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr value. __ip_options_echo() then reads optlen from attacker-controlled packet data at sptr[rr+1] and copies that many bytes into dopt->__data, a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).
Leer descripción completaMostrar menos
To fix this we clear skb2->cb[], as suggested by Oskar Kjos.
Also add minimal IPv4 header validation (version == 4, ihl >= 5).
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.83%
- Percentil entre todas las CVEs puntuadas: 56
- 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
T1190Exploit Public-Facing Applicationinitial access92 % - Impacto principal
T1059Command and Scripting Interpreterexecution85 % - Impacto secundario
T1068Exploitation for Privilege Escalationprivilege escalation78 %
Buffer overflow (CWE-787) en manejo de paquetes IPv6→IPv4 sin autenticación (AV:N/PR:N/UI:N) permite ejecución de código arbitrario en kernel Linux con privilegios de root.
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-787
- CWE-843
Referencias
- https://git.kernel.org/stable/c/1063515ce15ff31065c4e7f8265f4c2fd3c54876
- https://git.kernel.org/stable/c/2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5
- https://git.kernel.org/stable/c/2edfa31769a4add828a7e604b21cb82aaaa05925
- https://git.kernel.org/stable/c/4a622658f384b03560834cbe8ffcfe69a278f7c8
- https://git.kernel.org/stable/c/590f622669b97eaf7b57a1de7b0a6e68c5d8b2c3
- https://git.kernel.org/stable/c/a0c4ce9900a108eaf55d0f3b399cb55999647d39
- https://git.kernel.org/stable/c/d6621f60192fe10c047a4487be42a6f4c150707f
- https://git.kernel.org/stable/c/ea9f65b27c8404e164848ebff1443310fd187629
- https://access.redhat.com/errata/RHSA-2026:22900
- https://access.redhat.com/errata/RHSA-2026:22940
- https://access.redhat.com/errata/RHSA-2026:22964
- https://access.redhat.com/errata/RHSA-2026:23224
- https://access.redhat.com/errata/RHSA-2026:23237
- https://access.redhat.com/errata/RHSA-2026:24343
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:25120
- https://access.redhat.com/errata/RHSA-2026:25121
- https://access.redhat.com/errata/RHSA-2026:25181
- https://access.redhat.com/errata/RHSA-2026:25186
- https://access.redhat.com/errata/RHSA-2026:25191
- https://access.redhat.com/errata/RHSA-2026:25193
- https://access.redhat.com/errata/RHSA-2026:25200
- https://access.redhat.com/errata/RHSA-2026:25217
- https://access.redhat.com/errata/RHSA-2026:25533
- https://access.redhat.com/errata/RHSA-2026:25534
- https://access.redhat.com/errata/RHSA-2026:26528
- https://access.redhat.com/errata/RHSA-2026:26535
- https://access.redhat.com/errata/RHSA-2026:26542
- https://access.redhat.com/errata/RHSA-2026:27719
- https://access.redhat.com/errata/RHSA-2026:27729
- https://access.redhat.com/errata/RHSA-2026:28738
- https://access.redhat.com/errata/RHSA-2026:28740
- https://access.redhat.com/errata/RHSA-2026:28741
- https://access.redhat.com/errata/RHSA-2026:28742
- https://access.redhat.com/errata/RHSA-2026:28748
- https://access.redhat.com/errata/RHSA-2026:28749
- https://access.redhat.com/errata/RHSA-2026:28750
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:28962
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/errata/RHSA-2026:41236
- https://access.redhat.com/errata/RHSA-2026:44232
- https://access.redhat.com/security/cve/CVE-2026-43037
- https://bugzilla.redhat.com/show_bug.cgi?id=2464351
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43037.json
JSON original (NVD)
Mostrar
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