{"id":"CVE-2026-99064","title":"cipso: adjust cached option offsets when removing CIPSO","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncipso: adjust cached option offsets when removing CIPSO\n\ncipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust\ncached offsets for options that follow th…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < b965977126a90e01825814c859ba4788691eddd3","Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 2200fe1d6148b78e1b8f00f4b2bd47760015077f","Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0","Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 6d25ffca055a77787c21a36b66c253f76239411b","Linux 6.10"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:23:05.854Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99064","references":[{"url":"https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"},{"url":"https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"},{"url":"https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"},{"url":"https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.518Z","slug":"CVE-2026-99064","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncipso: adjust cached option offsets when removing CIPSO\n\ncipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust\ncached offsets for options that follow them.\n\nFor example, with a valid 10-byte CIPSO option followed by a seven-byte\nRR option, parsing records rr at offset 30.  Removing CIPSO moves RR to\noffset 20, while the cached offset remains 30.  Consumers such as\nip_forward_options() and __ip_options_echo() then access the wrong bytes;\nthe latter may interpret packet data as the option length and copy it into\nfixed-size option storage.\n\nMirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and\nrouter_alert offsets when they follow CIPSO.  cipso_len is the distance\nthe first memmove() shifts those options.  The later header move and\nnetwork-header reset relocate the bytes and their offset base together.\n\n## Affected\n\n- `Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < b965977126a90e01825814c859ba4788691eddd3`\n- `Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 2200fe1d6148b78e1b8f00f4b2bd47760015077f`\n- `Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0`\n- `Linux >= 89aa3619d141d6cfb6040a561aebb6d99d3e2285 < 6d25ffca055a77787c21a36b66c253f76239411b`\n- `Linux 6.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}