{"schema":"threatline.record/2","record":{"id":"CVE-2026-98037","aliases":[],"summary":"bpf: Reject untrusted allocated-object pointers","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject untrusted allocated-object pointers\n\nWhen the final RCU read-side critical section ends, a local kptr is demoted\nto PTR_UNTRUSTED but retains MEM_ALLOC. The pointer may be NULL or may refer\nto an object whose lifetime is no longer protected.\n\ntype_is_ptr_alloc_obj() nevertheless recognizes any PTR_TO_BTF_ID with\nMEM_ALLOC as a live allocated object. In particular, a refcount-only local\nkptr never carries NON_OWN_REF, so it still passes the\nbpf_refcount_acquire() argument check after RCU protection ends. The kfunc\ncan then dereference NULL or stale memory.\n\nMake type_is_ptr_alloc_obj() reject PTR_UNTRUSTED pointers. Since\ntype_is_non_owning_ref() is based on the same predicate, graph kfunc\narguments obey the same live-object requirement. Fault-protected reads of\nthe demoted pointer remain valid: writes are already rejected, and read\nfixups use bpf_may_fault_on_deref() rather than this predicate.\n\n[ kkd: Rewrote commit log ]","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"1b12171533a9bb23cf6fba7262b479028b65e1e8","lessThan":"092c2874dc1b2060fa77a465a971acd4fdf87683","status":"affected","versionType":"git"},{"version":"1b12171533a9bb23cf6fba7262b479028b65e1e8","lessThan":"135d542b97fa93e32c457d49d6e7b33ca7d05bae","status":"affected","versionType":"git"},{"version":"1b12171533a9bb23cf6fba7262b479028b65e1e8","lessThan":"6b1f786ad85a0b63393b76f5e634deab1a73198c","status":"affected","versionType":"git"},{"version":"1b12171533a9bb23cf6fba7262b479028b65e1e8","lessThan":"7441ee8276641bddaf1cba7bb75ef9c1458ceb3b","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.8","status":"affected"},{"version":"0","lessThan":"6.8","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-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"092c2874dc1b2060fa77a465a971acd4fdf87683","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"135d542b97fa93e32c457d49d6e7b33ca7d05bae","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6b1f786ad85a0b63393b76f5e634deab1a73198c","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","source_modified_at":"2026-10-19T09:12:42.963Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7441ee8276641bddaf1cba7bb75ef9c1458ceb3b","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05747,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:51.126Z","modified_at":"2026-10-19T09:12:42.963Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98037","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:12:42.963Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98037","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/092c2874dc1b2060fa77a465a971acd4fdf87683"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/135d542b97fa93e32c457d49d6e7b33ca7d05bae"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6b1f786ad85a0b63393b76f5e634deab1a73198c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7441ee8276641bddaf1cba7bb75ef9c1458ceb3b"}],"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":"2026-10-19T09:12:42.963Z","content_hash":"0b58c191ab57fa07b2167d74d45e6e592b1c7940f7e21aab79084499979544b6"}}