{"id":"CVE-2026-31407","summary":"netfilter: conntrack: add missing netlink policy validations","details":"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-\u003eproto.sctp.state without checking that it is\n  within the valid range. [..]\n\n  and: ... with exp-\u003edir = 100, the access at\n  ct-\u003emaster-\u003etuplehash[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.","modified":"2026-05-13T03:53:04.523874283Z","published":"2026-04-06T07:38:19.712Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31407.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31407.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31407"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a258860e01b80e8f554a4ab1a6c95e6042eb8b73"},{"fixed":"c5e918390002edf0cff80a0e7ce1f86f16a9507c"},{"fixed":"9174d28f3f15d8c4962f5980c0be167633880443"},{"fixed":"67c53c1978cef3c504237275e39c857e2f6af56e"},{"fixed":"0fbae1e74493d5a160a70c51aeba035d8266ea7d"},{"fixed":"f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31407.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.27"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31407.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}