{"id":"CVE-2026-31407","title":"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 w…","summary":"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 w…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-787"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.27, < 6.6.136","linux_kernel >= 6.7, < 6.12.83","linux_kernel >= 6.13, < 6.18.24","linux_kernel >= 6.19, < 6.19.10","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.10"],"published":"2026-04-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:02.410","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31407","references":[{"url":"https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00167,"epssPercentile":0.05516,"ingestedAt":"2026-10-15T03:30:12.852Z","slug":"CVE-2026-31407","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 2.6.27, < 6.6.136`\n- `linux_kernel >= 6.7, < 6.12.83`\n- `linux_kernel >= 6.13, < 6.18.24`\n- `linux_kernel >= 6.19, < 6.19.10`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.10`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}