{"schema":"threatline.record/2","record":{"id":"CVE-2026-98856","aliases":[],"summary":"kprobes: Skip disarmed probes when checking optkprobe overlap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n              A    A+1  A+2  A+3  A+4\n  A's jump  | e9 | d0 | d1 | d2 | d3 |\n  after C   | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","lessThan":"3f968dcdf018861129f97910fa7bd680d939a9b0","status":"affected","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","lessThan":"985a568171e7bdba6dcde3420d0e5bb515813457","status":"affected","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","lessThan":"6745fa65f4115045431c0c15610e876855a04625","status":"affected","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","lessThan":"526fac219e8b7d3369b43026bd0a1df51b811cd4","status":"affected","versionType":"git"},{"version":"afd66255b9a48f5851326ddae50e2203fbf71dc9","lessThan":"7a39c732a22ec4a369af9e19fbe3d666ec83eec4","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","lessThan":"2.6.34","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":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","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-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"3f968dcdf018861129f97910fa7bd680d939a9b0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"985a568171e7bdba6dcde3420d0e5bb515813457","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6745fa65f4115045431c0c15610e876855a04625","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"526fac219e8b7d3369b43026bd0a1df51b811cd4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","source_modified_at":"2026-10-21T12:57:35.270Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7a39c732a22ec4a369af9e19fbe3d666ec83eec4","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00169,"percentile":0.0593,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:51:12.359Z","modified_at":"2026-10-21T12:57:35.270Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98856","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:57:35.270Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98856","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/3f968dcdf018861129f97910fa7bd680d939a9b0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"}],"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":"2026-10-21T12:57:35.270Z","content_hash":"db019c56ae16c7d9f953ff59b012ef69d75409427584dbc4cb99021d761d1e39"}}