CVE-2026-98586
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
sctp: mantener la referencia de asoc o transport antes de mod_timer() en los manejadores de temporizadores
Obtener la referencia de la asociación o del transporte antes de rearmar un temporizador en los manejadores de temporizadores.
El código existente llama a mod_timer() antes de obtener la referencia necesaria para el temporizador rearmado, sin mantener el bloqueo del socket.
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Esto crea una condición de carrera con la limpieza de temporizadores: si el temporizador se elimina después de que mod_timer() retorne pero antes de que se obtenga la referencia, la ruta de limpieza puede liberar la referencia del temporizador y destruir el transporte o la asociación. El manejador del temporizador toma entonces una referencia sobre un objeto ya liberado y, finalmente, la libera, provocando un underflow del contador de referencias (refcount underflow).
Mantener el objeto antes de mod_timer() y liberar la referencia si mod_timer() indica que el temporizador ya estaba pendiente en los manejadores de temporizadores. Aplicar el mismo orden a la ruta de proto-unreachable, que puede rearmar un temporizador de transporte fuera de los manejadores de temporizadores sin mantener el bloqueo del socket.
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
- 0.17 %
- Percentil entre todas las CVEs puntuadas
- 6
- 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 7 referencias
- https://git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2
- https://git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda
- https://git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434
- https://git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f
- https://git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f
- https://git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050
- https://git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98586",
"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": "f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "f9d929026d487a988bfa12c065f892e823e5b6ab",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "9d3d39da054476e7aa05cd877b93ca73a9a77434",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "27c51a9b55b227309161c903f9ecfbf022516bc2",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "35bf3b23c9a871f44c1453d85f8332be4e088dda",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "cae23ae3f7887a1cf8a75da38edcebeef695040f",
"versionType": "git"
}
],
"programFiles": [
"net/sctp/input.c",
"net/sctp/sm_sideeffect.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": "5.15.222",
"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/sctp/input.c",
"net/sctp/sm_sideeffect.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:11.180",
"references": [
{
"url": "https://git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: hold asoc or transport before mod_timer() in timer handlers\n\nTake the association or transport reference before rearming a timer in the\ntimer handlers.\n\nThe existing code calls mod_timer() before taking the reference needed by\nthe rearmed timer without holding the sock lock. This creates a race with\ntimer cleanup: if the timer is deleted after mod_timer() returns but before\nthe reference is taken, the cleanup path can drop the timer's reference and\ndestroy the transport or association. The timer handler then takes a\nreference on the already freed object and eventually drops it, causing a\nrefcount underflow.\n\nHold the object before mod_timer() and drop the reference if mod_timer()\nreports that the timer was already pending in timer handlers. Apply the\nsame ordering to the proto-unreachable path, which can rearm a transport\ntimer outside the timer handlers without holding the sock lock."
}
],
"lastModified": "2026-10-19T10:19:19.507",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}