{"id":"CVE-2026-63926","title":"bpf: sockmap: fix tail fragment offset in bpf_msg_push_data","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: fix tail fragment offset in bpf_msg_push_data\n\nWhen bpf_msg_push_data() inserts data in the middle of a scatterlist\nentry, it splits the original entry in…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f14609d8146707452e0822f3c8154674ce677251","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < d81b323af2dcee47573907ccb89c0df9b45cb2e2","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < aeb95146848d12206e1b2cfacd4f40e21ce81d94","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 96b72672ce849a1402730238e64d9b20bf06a96d","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 3075c21d2d76c0067f4a382765b43d6cc10470f1","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 5e19028667963fb371ebb00cecc2a473ef92056b","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 63f64a510c7917658ddf4d073ece73914ee25346","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f72eed9b84fb771019a955908132410a9ba9ea3f","Linux 4.20"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:33:38.098543Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:12.612Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63926","references":[{"url":"https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251"},{"url":"https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2"},{"url":"https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94"},{"url":"https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d"},{"url":"https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1"},{"url":"https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b"},{"url":"https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346"},{"url":"https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f"}],"tags":["cve.org"],"epss":0.00185,"epssPercentile":0.07564,"ingestedAt":"2026-10-16T17:24:46.778Z","slug":"CVE-2026-63926","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: fix tail fragment offset in bpf_msg_push_data\n\nWhen bpf_msg_push_data() inserts data in the middle of a scatterlist\nentry, it splits the original entry into a left fragment and a right\nfragment.\n\nThe right fragment offset is page-local, but the code advances it with\n`start`, which is the message-global insertion point. For inserts into a\nnon-first SG entry, this over-advances the offset and leaves the split\nlayout inconsistent.\n\nAdvance the right fragment offset by the fragment-local delta,\n`start - offset`, which matches the length removed from the front of the\noriginal entry.\n\n## Affected\n\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f14609d8146707452e0822f3c8154674ce677251`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < d81b323af2dcee47573907ccb89c0df9b45cb2e2`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < aeb95146848d12206e1b2cfacd4f40e21ce81d94`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 96b72672ce849a1402730238e64d9b20bf06a96d`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 3075c21d2d76c0067f4a382765b43d6cc10470f1`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 5e19028667963fb371ebb00cecc2a473ef92056b`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 63f64a510c7917658ddf4d073ece73914ee25346`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f72eed9b84fb771019a955908132410a9ba9ea3f`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}