CVE-2026-64047
Estado: AnalizadaCrítica (9.8)—
In the Linux kernel, the following vulnerability has been resolved:
net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this:
The current code uses MAX_SKB_FRAGS + 1 as the ring size:
This places the chain pointer at
instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down")
Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).
Detalles técnicos trazas, registros y código del informe original
struct sk_msg_sg {
[...]
/* The extra two elements:
* 1) used for chaining the front and sections when the list becomes
* partitioned (e.g. end < start). The crypto APIs require the
* chaining;
* 2) to chain tailer SG entries after the message.
*/
struct scatterlist data[MAX_MSG_FRAGS + 2];
sg_chain(&msg_pl->sg.data[msg_pl->sg.start],
MAX_SKB_FRAGS - msg_pl->sg.start + 1,
msg_pl->sg.data);
sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =
&data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =
data[start + (MAX_SKB_FRAGS - start + 1) - 1] =
data[MAX_SKB_FRAGS]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: 0.51%
- Percentil entre todas las CVEs puntuadas: 42
- 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 access75 % - Impacto principal
T1499.004Application or System Exploitationimpact65 %
Vulnerabilidad remota en kernel Linux (AV:N, PR:N, UI:N) con impacto crítico (C:H, I:H, A:H). Off-by-one en manejo de scatterlist permite corrupción de memoria y DoS en procesamiento de TLS.
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-193
Referencias
- https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97
- https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a
- https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628
- https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc
- https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d
- https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd
- https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522
- https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n struct sk_msg_sg {\n [...]\n /* The extra two elements:\n * 1) used for chaining the front and sections when the list becomes\n * partitioned (e.g. end < start). The crypto APIs require the\n * chaining;\n * 2) to chain tailer SG entries after the message.\n */\n struct scatterlist data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n msg_pl->sg.data);\n\nThis places the chain pointer at\n\n sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina)."
}
],
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