{"schema":"threatline.record/2","record":{"id":"CVE-2026-98043","aliases":[],"summary":"bpf: Don't infer non-NULL from a pointer with an unbounded offset","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't infer non-NULL from a pointer with an unbounded offset\n\nreg_not_null() decides that a register holds a non-NULL value by\nlooking at its type alone. For pointer types that allow arithmetic the\ntype only guarantees a non-NULL base, in case of an unbound offset\nthe runtime offset value might still add up to NULL.\nConsider the followng program:\n\n  r6 = bpf_map_lookup_elem(map, &0);  /* present */\n  if (r6 == 0) return 0;\n  r7 = bpf_map_lookup_elem(map, &1);  /* absent, NULL at runtime */\n  r8 = r7;\n  r8 -= r6;     /* pointer - pointer: unknown scalar, -r6 */\n  r8 <<= 1;\n  r8 >>= 1;     /* any non-negative offset is accepted by */\n                /* check_reg_sane_offset_ptr() */\n  r6 += r8;     /* verifier: map value;    runtime: zero  */\n  if (r7 != r6) return 0;\n  *(u8 *)(r7 + 0);  /* r7 is inferred non-NULL, both are zero */\n\nAt runtime both registers are zero, the comparison is true and the\nload faults with NULL pointer dereference.\n\nRequire the offset to be within +-BPF_MAX_VAR_OFF in reg_not_null().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"cac616db39c207dc63465a4e05c6ce0e60b2cce4","lessThan":"8b414dbe97fcefd116e5a620c3bd9993014aa4ce","status":"affected","versionType":"git"},{"version":"cac616db39c207dc63465a4e05c6ce0e60b2cce4","lessThan":"019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae","status":"affected","versionType":"git"},{"version":"cac616db39c207dc63465a4e05c6ce0e60b2cce4","lessThan":"65bea674f43c09c0eda033a140dfac6a2842a19f","status":"affected","versionType":"git"},{"version":"cac616db39c207dc63465a4e05c6ce0e60b2cce4","lessThan":"cb6642048739bf4ee5aa09fe465511f1e87caa63","status":"affected","versionType":"git"},{"version":"cac616db39c207dc63465a4e05c6ce0e60b2cce4","lessThan":"67b529f521a6676cdfc78b91b0217d7eaa84216b","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.8","status":"affected"},{"version":"0","lessThan":"5.8","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.114","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","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-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8b414dbe97fcefd116e5a620c3bd9993014aa4ce","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"65bea674f43c09c0eda033a140dfac6a2842a19f","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","source_modified_at":"2026-10-21T12:54:11.750Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"67b529f521a6676cdfc78b91b0217d7eaa84216b","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09338,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:54.865Z","modified_at":"2026-10-21T12:54:11.750Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98043","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:54:11.750Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98043","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/8b414dbe97fcefd116e5a620c3bd9993014aa4ce"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/65bea674f43c09c0eda033a140dfac6a2842a19f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cb6642048739bf4ee5aa09fe465511f1e87caa63"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/67b529f521a6676cdfc78b91b0217d7eaa84216b"}],"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":"2026-10-21T12:54:11.750Z","content_hash":"c04b14cb6c61fb12fe5bafbd23db3539cd5ebbd82b1b49a22bcb5cbbde1a8712"}}