{"schema":"threatline.record/2","record":{"id":"CVE-2026-98039","aliases":[],"summary":"bpf: Require MEM_PERCPU for percpu kptr stores","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Require MEM_PERCPU for percpu kptr stores\n\nmap_kptr_match_type() treats perm_flags as the set of register type flags\nthat a kptr field permits. Adding MEM_PERCPU to that set for\nBPF_KPTR_PERCPU does not require the source register to carry it, however.\nThe subset test consequently accepts both a plain bpf_obj_new() allocation\nand a referenced kernel pointer into a __percpu_kptr map field.\n\nLoads from the field are always marked MEM_PERCPU. Consumers then treat the\nstored value as the cookie returned by bpf_percpu_obj_new(): per-CPU pointer\nhelpers relocate it, and map teardown selects the per-CPU free path. A plain\nallocation can therefore provide an arbitrary kernel read/write, while a\nkernel pointer can be relocated into an invalid address or sent through a\nmissing destructor.\n\nRequire the source MEM_PERCPU flag to match the destination field kind.\nThis preserves valid bpf_percpu_obj_new() stores and rejects both the\nprogram-BTF and kernel-BTF variants.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98039","source_modified_at":"2026-10-19T09:12:44.994Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"36d8bdf75a93190e5669b9d1d95994e13e15ba1d","lessThan":"aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f","status":"affected","versionType":"git"},{"version":"36d8bdf75a93190e5669b9d1d95994e13e15ba1d","lessThan":"0bdd6121c8dd5f1764efe701ce26bb8e15acb172","status":"affected","versionType":"git"},{"version":"36d8bdf75a93190e5669b9d1d95994e13e15ba1d","lessThan":"ad4ebae5dbc2d47b544aa54f03c12490065be08a","status":"affected","versionType":"git"},{"version":"36d8bdf75a93190e5669b9d1d95994e13e15ba1d","lessThan":"048029ba1c793f8cabc4ad5eea765da01903f8f1","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98039","source_modified_at":"2026-10-19T09:12:44.994Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.7","status":"affected"},{"version":"0","lessThan":"6.7","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","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-2026-98039","source_modified_at":"2026-10-19T09:12:44.994Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0bdd6121c8dd5f1764efe701ce26bb8e15acb172","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98039","source_modified_at":"2026-10-19T09:12:44.994Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"048029ba1c793f8cabc4ad5eea765da01903f8f1","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05757,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:52.360Z","modified_at":"2026-10-19T09:12:44.994Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98039","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:12:44.994Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98039","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/aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0bdd6121c8dd5f1764efe701ce26bb8e15acb172"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ad4ebae5dbc2d47b544aa54f03c12490065be08a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/048029ba1c793f8cabc4ad5eea765da01903f8f1"}],"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":"2026-10-19T09:12:44.994Z","content_hash":"30b3d06613ad09c73a342d228998d68e4a05f766b90ffda5c7f6188d01840069"}}