CVE-2026-31407
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
Severity
HIGH
CVSS score
7.1
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-06 08:16:38.623000
Last modified
2026-10-19 19:17:52.043000
View original CVE JSON
{
"id": "CVE-2026-31407",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-04-06T08:16:38.623",
"lastModified": "2026-10-19T19:17:52.043",
"vulnStatus": "Modified",
"cveTags": [],
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n value directly to ct->proto.sctp.state without checking that it is\n within the valid range. [..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: conntrack: añadir validaciones de políticas netlink faltantes\n\nHyunwoo Kim informa de acceso fuera de límites en sctp y ctnetlink.\n\nEstos atributos son utilizados por el kernel sin ninguna validación.\nExtender las políticas netlink en consecuencia.\n\nCitando al informante:\n 'nlattr_to_sctp() asigna el valor CTA_PROTOINFO_SCTP_STATE proporcionado por el usuario\n directamente a ct -> proto.sctp.state sin comprobar que esté\n dentro del rango válido. [..]\n\n y: ... con exp -> dir = 100, el acceso en\n ct -> master -> tuplehash[100] lee 5600 bytes más allá del inicio de un\n objeto nf_conn de 320 bytes, causando una lectura fuera de límites de slab confirmada por\n UBSAN.'"
}
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