{"schema":"threatline.record/2","record":{"id":"CVE-2026-98540","aliases":[],"summary":"fprobe: Terminate the fgraph_data list when the reservation is not filled","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfprobe: Terminate the fgraph_data list when the reservation is not filled\n\nfprobe_fgraph_entry() reserves shadow stack space for every fprobe with\nan exit handler, but only fills it for those whose entry handler returns\n0. fgraph_reserve_data() does not clear the area, so fprobe_return()\nparses the unused tail as headers left over from an earlier call, and an\nexit handler can run twice or despite its entry handler asking to skip\nit.\n\nWrite a zero word after the last entry to terminate the walk. A zeroed\nslot does not decode to a NULL fprobe on the arches that encode the\nheader into one unsigned long, since arch_decode_fprobe_header_fp() ORs\nin FPROBE_HEADER_MSB_PATTERN, so make read_fprobe_header() return NULL\nfor a zeroed slot.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98540","source_modified_at":"2026-10-19T09:21:23.633Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"e0a384434ae1bdfb03954c46c464e3dbd3223ad6","lessThan":"b7459fddcb27a4b7d01067678172afa362cf660d","status":"affected","versionType":"git"},{"version":"e0a384434ae1bdfb03954c46c464e3dbd3223ad6","lessThan":"1d653a183973f5283a3db5a38cd5e195eb152244","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98540","source_modified_at":"2026-10-19T09:21:23.633Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","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-2026-98540","source_modified_at":"2026-10-19T09:21:23.633Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1d653a183973f5283a3db5a38cd5e195eb152244","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00189,"percentile":0.08115,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:18:08.352Z","modified_at":"2026-10-19T09:21:23.633Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98540","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:21:23.633Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98540","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/b7459fddcb27a4b7d01067678172afa362cf660d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1d653a183973f5283a3db5a38cd5e195eb152244"}],"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":"2026-10-19T09:21:23.633Z","content_hash":"29e1ceb815cff1218d7cb9cff96fa76e5bd48047204e7d5a7ff84a0b5ce2cdaf"}}