{"schema":"threatline.record/2","record":{"id":"CVE-2026-98950","aliases":[],"summary":"flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nflow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()\n\nbpf_flow_dissect() sanitizes the offsets returned by the BPF program\nwith clamp_t(u16, ..., hlen).\n\nIf hlen is bigger than 65535, the upper bound is truncated before\nthe comparison. For instance, with hlen == 65536, both nhoff and\nthoff are forced to zero, even if the program returned sane values.\n\nThis is the same class of bug as the one fixed in commit 99bda1ecbd56\n(\"flow_dissector: avoid u16 truncation of skb->len when computing\nthoff\"). That fix does not cover the BPF path, because\n__skb_flow_dissect() returns early when a BPF flow dissector\nhandles the packet.\n\nstruct bpf_flow_keys stores nhoff and thoff as u16, so cap hlen\nto U16_MAX before clamping.\n\nFound by sashiko while reviewing the commit above.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98950","source_modified_at":"2026-10-23T12:19:09.890Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","lessThan":"c44c02c930c6583b235a1937c69ff716c4bb4514","status":"affected","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","lessThan":"3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a","status":"affected","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","lessThan":"cc18eb0e9941162c03f03f411ed7f6c339d91fa0","status":"affected","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","lessThan":"61b43a51a55929ec040bee3ea51af2121b956d05","status":"affected","versionType":"git"},{"version":"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9","lessThan":"f202578efc738b883cfa04889eb97328914265a7","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98950","source_modified_at":"2026-10-23T12:19:09.890Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98950","source_modified_at":"2026-10-23T12:19:09.890Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98950","source_modified_at":"2026-10-23T12:19:09.890Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"61b43a51a55929ec040bee3ea51af2121b956d05","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:19:09.890Z","modified_at":"2026-10-23T12:19:09.890Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98950","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:19:09.890Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/c44c02c930c6583b235a1937c69ff716c4bb4514"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cc18eb0e9941162c03f03f411ed7f6c339d91fa0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/61b43a51a55929ec040bee3ea51af2121b956d05"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f202578efc738b883cfa04889eb97328914265a7"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:19:09.890Z","content_hash":"c659213d4dba9e42db51b7cae99c49704deeecce10afa9911c3ed070d8decbfb"}}