CVE-2026-98485
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
netfilter: ip6t_rt: corregir una lectura fuera de límites en la comparación no estricta con dirección cero
rt_mt6_check() permite configurar reglas con rtinfo->addrnr == 0 incluso cuando se solicita la comparación de direcciones (IP6T_RT_FST_MASK).
En la ruta IP6T_RT_FST_NSTRICT, rt_mt6() evalúa las direcciones de enrutamiento del paquete frente a rtinfo->addrs[i] y termina hacia atrás en la parte inferior del bucle:
Cuando addrnr es 0, si la primera dirección del paquete coincide con rtinfo->addrs[0], i se incrementa a 1. Como i pasa a ser estrictamente mayor que addrnr (0), la condición de terminación del bucle (i == rtinfo->addrnr) se omite y nunca llegará a cumplirse.
Leer descripción completaMostrar menos
Si un paquete IPv6 manipulado contiene direcciones de enrutamiento coincidentes, i avanzará más allá de IP6T_RT_HOPS (16). La llamada posterior a ipv6_addr_equal() lee más allá de struct ip6t_rt, lo que provoca advertencias de lectura fuera de límites de UBSAN/KASAN o pánicos del kernel.
Para corregirlo: 1. Rechazar en rt_mt6_check() las reglas en las que IP6T_RT_FST_MASK está establecido pero rtinfo->addrnr es cero. 2. En rt_mt6(), trasladar la condición de terminación (i < rtinfo->addrnr) a la condición de la cabecera del bucle for y eliminar el break hacia atrás al final del cuerpo del bucle.
Detalles técnicos trazas, registros y código del informe original
if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
i++;
}
if (i == rtinfo->addrnr)
break;Traducción automática del texto original de NVD (en inglés).
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días
- 0.22 %
- Percentil entre todas las CVEs puntuadas
- 12
- Fecha de la puntuación
- 20/10/2026
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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
Mostrar las 8 referencias
- https://git.kernel.org/stable/c/191239b0939692e92459d8d32cad14247fa93f89
- https://git.kernel.org/stable/c/5a54f8b7f7fe207a5c14713015a5820588faf1ad
- https://git.kernel.org/stable/c/82313c169eddc02b1bf5ba6b427803e272d3ec42
- https://git.kernel.org/stable/c/959d1829d1ce8b91b435b24a923b51bcc8897090
- https://git.kernel.org/stable/c/b89249819a7d6698bed152feafd3bc6c08489d15
- https://git.kernel.org/stable/c/d9cf4ac6f326330e1fe4d95671d36a6ff3593f64
- https://git.kernel.org/stable/c/dd55c0ea87bf70e4e4b3b683acd29ef981335b26
- https://git.kernel.org/stable/c/fe336bab13834394320997de8b16ca4a913b4f13
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98485",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "959d1829d1ce8b91b435b24a923b51bcc8897090",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "fe336bab13834394320997de8b16ca4a913b4f13",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "5a54f8b7f7fe207a5c14713015a5820588faf1ad",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "b89249819a7d6698bed152feafd3bc6c08489d15",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "dd55c0ea87bf70e4e4b3b683acd29ef981335b26",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "191239b0939692e92459d8d32cad14247fa93f89",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "d9cf4ac6f326330e1fe4d95671d36a6ff3593f64",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "82313c169eddc02b1bf5ba6b427803e272d3ec42",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/netfilter/ip6t_rt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/netfilter/ip6t_rt.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:16:59.187",
"references": [
{
"url": "https://git.kernel.org/stable/c/191239b0939692e92459d8d32cad14247fa93f89",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5a54f8b7f7fe207a5c14713015a5820588faf1ad",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/82313c169eddc02b1bf5ba6b427803e272d3ec42",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/959d1829d1ce8b91b435b24a923b51bcc8897090",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b89249819a7d6698bed152feafd3bc6c08489d15",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d9cf4ac6f326330e1fe4d95671d36a6ff3593f64",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dd55c0ea87bf70e4e4b3b683acd29ef981335b26",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fe336bab13834394320997de8b16ca4a913b4f13",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rt: fix zero-address non-strict match out-of-bounds read\n\nrt_mt6_check() permits rules to be configured with rtinfo->addrnr == 0\neven when address matching (IP6T_RT_FST_MASK) is requested.\n\nIn the IP6T_RT_FST_NSTRICT path, rt_mt6() evaluates packet routing\naddresses against rtinfo->addrs[i] and terminates backwards at the bottom\nof the loop:\n\n if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {\n i++;\n }\n if (i == rtinfo->addrnr)\n break;\n\nWhen addrnr is 0, if the first packet address matches rtinfo->addrs[0],\ni is incremented to 1. Because i is now strictly greater than addrnr (0),\nthe loop termination condition (i == rtinfo->addrnr) is bypassed and will\nnever be satisfied.\n\nIf a crafted IPv6 packet contains matching routing addresses, i will\nadvance past IP6T_RT_HOPS (16). The subsequent call to ipv6_addr_equal()\nreads beyond struct ip6t_rt, triggering UBSAN/KASAN out-of-bounds warnings\nor kernel panics.\n\nFix this by:\n1. Rejecting rules in rt_mt6_check() where IP6T_RT_FST_MASK is set but\n rtinfo->addrnr is zero.\n2. In rt_mt6(), moving the termination condition (i < rtinfo->addrnr)\n into the for-loop header condition and removing the backwards break\n at the end of the loop body."
}
],
"lastModified": "2026-10-19T10:18:59.967",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}