CVE-2026-98600
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
Bluetooth: RFCOMM: Rechazar tramas cortas con EA=0 en rfcomm_recv_frame()
Aunque rfcomm_recv_frame() verifica que skb->len sea al menos sizeof(*hdr) + 1 (4 bytes: cabecera de 3 bytes + 1 byte de FCS), una trama RFCOMM con campo de longitud extendido de 2 bytes (!__test_ea(hdr->len)) tiene una cabecera de 4 bytes más un byte de FCS (5 bytes como mínimo, sizeof(*hdr) + 2).
Cuando llega una trama RFCOMM de 4 bytes con EA == 0: 1. La comprobación inicial skb->len < sizeof(*hdr) + 1 se supera (4 < 4 es falso). 2. Al recortar el byte de FCS, skb->len se reduce a 3. 3.
Leer descripción completaMostrar menos
Si __check_fcs() tiene éxito, skb_pull(skb, 4) falla (4 > 3) y devuelve NULL sin avanzar skb->data. 4. Como el valor de retorno de skb_pull() se ignora, la estructura struct rfcomm_hdr de 3 bytes sin extraer permanece en skb->data y se encola como carga útil de aplicación mediante rfcomm_recv_data() o se interpreta como un comando de control del multiplexor mediante rfcomm_recv_mcc() en el DLCI 0.
Para corregirlo, se amplía la comprobación de longitud en rfcomm_recv_frame() para exigir también skb->len >= sizeof(*hdr) + 2 cuando !__test_ea(hdr->len).
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
- 0.18 %
- Percentil entre todas las CVEs puntuadas
- 7
- 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/6d91041bb38b97e2feb625123cc0529d7b83a0e1
- https://git.kernel.org/stable/c/71ccacde407b7d8f0ef48974a0d2524602fd5c44
- https://git.kernel.org/stable/c/76876fd26569302d26d91cbe8b75fa8e66cf8969
- https://git.kernel.org/stable/c/7a1781a2f3a9667b3065d402d1f11986a2363e08
- https://git.kernel.org/stable/c/9240fc1f2cde5331c61608da21b00394602ca762
- https://git.kernel.org/stable/c/97711b964877242933484989224a3c4c5d88a5ee
- https://git.kernel.org/stable/c/be00deee60044ffa820f9436415caeb665b2cda0
- https://git.kernel.org/stable/c/c25587fa26761e623198b4f47151fe79d09ccde6
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98600",
"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": "fb40eda15122f6b780228639c1ead6820340ff54",
"lessThan": "76876fd26569302d26d91cbe8b75fa8e66cf8969",
"versionType": "git"
},
{
"status": "affected",
"version": "3829af5fab5a22405bf1e7d69068c2ec0fce46ca",
"lessThan": "97711b964877242933484989224a3c4c5d88a5ee",
"versionType": "git"
},
{
"status": "affected",
"version": "b161eacd7fa4a2d765724b5504ac6cc388e48f80",
"lessThan": "7a1781a2f3a9667b3065d402d1f11986a2363e08",
"versionType": "git"
},
{
"status": "affected",
"version": "30d1d9f3495463f7c026e4c553127f79b486fcd6",
"lessThan": "c25587fa26761e623198b4f47151fe79d09ccde6",
"versionType": "git"
},
{
"status": "affected",
"version": "67dc3b40fae71b6b11c71e7ff69bac0758818c05",
"lessThan": "71ccacde407b7d8f0ef48974a0d2524602fd5c44",
"versionType": "git"
},
{
"status": "affected",
"version": "bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51",
"lessThan": "be00deee60044ffa820f9436415caeb665b2cda0",
"versionType": "git"
},
{
"status": "affected",
"version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
"lessThan": "9240fc1f2cde5331c61608da21b00394602ca762",
"versionType": "git"
},
{
"status": "affected",
"version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
"lessThan": "6d91041bb38b97e2feb625123cc0529d7b83a0e1",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.111",
"lessThan": "6.12.112",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.53",
"lessThan": "6.18.55",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/rfcomm/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.2",
"versionType": "semver"
},
{
"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/bluetooth/rfcomm/core.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:12.707",
"references": [
{
"url": "https://git.kernel.org/stable/c/6d91041bb38b97e2feb625123cc0529d7b83a0e1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/71ccacde407b7d8f0ef48974a0d2524602fd5c44",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/76876fd26569302d26d91cbe8b75fa8e66cf8969",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7a1781a2f3a9667b3065d402d1f11986a2363e08",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9240fc1f2cde5331c61608da21b00394602ca762",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/97711b964877242933484989224a3c4c5d88a5ee",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/be00deee60044ffa820f9436415caeb665b2cda0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c25587fa26761e623198b4f47151fe79d09ccde6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()\n\nWhile rfcomm_recv_frame() verifies that skb->len is at least\nsizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame\nwith an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte\nheader plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).\n\nWhen a 4-byte RFCOMM frame with EA == 0 arrives:\n1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false).\n2. Trimming the FCS byte decrements skb->len to 3.\n3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns\n NULL without advancing skb->data.\n4. Because the return value of skb_pull() is ignored, the un-pulled\n 3-byte struct rfcomm_hdr remains at skb->data and is either queued as\n application payload via rfcomm_recv_data() or parsed as a multiplexer\n control command via rfcomm_recv_mcc() on DLCI 0.\n\nFix this by extending the length check in rfcomm_recv_frame() to also\nrequire skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len)."
}
],
"lastModified": "2026-10-19T10:19:21.517",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}