{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31407","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.086Z","datePublished":"2026-04-06T07:38:19.712Z","dateUpdated":"2026-05-11T22:08:06.853Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:08:06.853Z"},"descriptions":[{"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_conntrack_netlink.c","net/netfilter/nf_conntrack_proto_sctp.c"],"versions":[{"version":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73","lessThan":"c5e918390002edf0cff80a0e7ce1f86f16a9507c","status":"affected","versionType":"git"},{"version":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73","lessThan":"9174d28f3f15d8c4962f5980c0be167633880443","status":"affected","versionType":"git"},{"version":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73","lessThan":"67c53c1978cef3c504237275e39c857e2f6af56e","status":"affected","versionType":"git"},{"version":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73","lessThan":"0fbae1e74493d5a160a70c51aeba035d8266ea7d","status":"affected","versionType":"git"},{"version":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73","lessThan":"f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_conntrack_netlink.c","net/netfilter/nf_conntrack_proto_sctp.c"],"versions":[{"version":"2.6.27","status":"affected"},{"version":"0","lessThan":"2.6.27","status":"unaffected","versionType":"semver"},{"version":"6.6.136","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.83","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.24","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.10","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c"},{"url":"https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443"},{"url":"https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e"},{"url":"https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"},{"url":"https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"}],"title":"netfilter: conntrack: add missing netlink policy validations","x_generator":{"engine":"bippy-1.2.0"}}}}