{"id":"CVE-2026-74747","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: revalidate ihl to prevent out-of-bounds access\n\nWhile the outer IP header is already pulled into the skb head,\nwe must be careful and revalidate the embedded head…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: revalidate ihl to prevent out-of-bounds access\n\nWhile the outer IP header is already pulled into the skb head,\nwe must be careful and revalidate the embedded head…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < eb81c8e758f49e04391f77d9470a6232bb5f1c7a","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5365f012451fce2453f13a568dcb72ea534c1e4d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d93660df4dd1d116f608ada4a29a80a5d6f0a6ed","Linux 2.6.12"],"published":"2026-08-26","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:49.550","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74747","references":[{"url":"https://git.kernel.org/stable/c/5365f012451fce2453f13a568dcb72ea534c1e4d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d93660df4dd1d116f608ada4a29a80a5d6f0a6ed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb81c8e758f49e04391f77d9470a6232bb5f1c7a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00165,"epssPercentile":0.0535,"ingestedAt":"2026-10-15T11:00:41.668Z","slug":"CVE-2026-74747","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipvs: revalidate ihl to prevent out-of-bounds access\n\nWhile the outer IP header is already pulled into the skb head,\nwe must be careful and revalidate the embedded headers after\nreading them from the skb frags to prevent out-of-bounds\naccess.\n\nOne such place reported by Sashiko is ip_vs_nat_icmp() where\nlocal process can change the ihl field and after\nskb_ensure_writable() we can see larger value which is a\nproblem for the ip_send_check(cih) calls.\n\nAdd check to drop the packet if the ihl field is changed.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}