{"schema":"threatline.record/2","record":{"id":"CVE-2026-98626","aliases":[],"summary":"bpf: Restrict CO-RE poisoning to relocatable instructions","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","source_modified_at":"2026-10-19T09:22:54.307Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"a8c47e62d9aea2d47a09e06c1682c59c21b92449","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"d3219c229d16900cef936adad28633c98946e432","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"f2a24101e89dd0804e717da7c1bd6af513698aa2","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"2d7d04357c41aa49a5ac658fcc207439f2ad6456","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","status":"affected","versionType":"git"},{"version":"d7a252708dbc950ca2064310217e8b9f85846e2f","lessThan":"394ae398337c5f87e567f6cd63b937fc2b2f6ddc","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","source_modified_at":"2026-10-19T09:22:54.307Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","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-2026-98626","source_modified_at":"2026-10-19T09:22:54.307Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2d7d04357c41aa49a5ac658fcc207439f2ad6456","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","source_modified_at":"2026-10-19T09:22:54.307Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","source_modified_at":"2026-10-19T09:22:54.307Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"394ae398337c5f87e567f6cd63b937fc2b2f6ddc","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00205,"percentile":0.1003,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:19:47.832Z","modified_at":"2026-10-19T09:22:54.307Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:22:54.307Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98626","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"}],"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":"2026-10-19T09:22:54.307Z","content_hash":"0a20572da024cc1666a8caa9fa034cb3cc89718e4258d1c38bb8851e5e9a996b"}}