{"schema":"threatline.record/2","record":{"id":"CVE-2026-98403","aliases":[],"summary":"s390/boot: Avoid IPL parameter append past command line","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/boot: Avoid IPL parameter append past command line\n\nA command line may occupy all but the terminating byte of\nCOMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size\nto the IPL parameter conversion helpers and points the destination one\nbyte past early_command_line. The helpers subtract one from the unsigned\nsize and write the converted parameter outside the command line buffer.\n\nConvert the IPL parameter in the command line parsing buffer first. A\nparameter beginning with '=' can then replace the existing command line\nregardless of its length, while other parameters are appended only when\nspace remains.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98403","source_modified_at":"2026-10-19T09:18:56.682Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5ecb2da660ab8eddafe059a6a8a708465db89ca2","lessThan":"af9866021a00ab9eeacf0c33ee73f3d134b4ed70","status":"affected","versionType":"git"},{"version":"5ecb2da660ab8eddafe059a6a8a708465db89ca2","lessThan":"73eec5a0d55916d7e1115f5d03a7ffc06d6215cf","status":"affected","versionType":"git"},{"version":"5ecb2da660ab8eddafe059a6a8a708465db89ca2","lessThan":"8d11bfec8666f8409fac9072e9c25b691d3e30ac","status":"affected","versionType":"git"},{"version":"5ecb2da660ab8eddafe059a6a8a708465db89ca2","lessThan":"d76181dfabdaa720703167393704efacba343442","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98403","source_modified_at":"2026-10-19T09:18:56.682Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"6.12.112","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-2026-98403","source_modified_at":"2026-10-19T09:18:56.682Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"73eec5a0d55916d7e1115f5d03a7ffc06d6215cf","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98403","source_modified_at":"2026-10-19T09:18:56.682Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8d11bfec8666f8409fac9072e9c25b691d3e30ac","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00209,"percentile":0.10534,"score_date":"2026-10-23"},"published_at":"2026-10-14T13:26:02.916Z","modified_at":"2026-10-19T09:18:56.682Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98403","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:18:56.682Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98403","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/af9866021a00ab9eeacf0c33ee73f3d134b4ed70"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442"}],"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":"2026-10-19T09:18:56.682Z","content_hash":"9a07f31679dd319ac3a3f73b980cf91ec2e99dcf16d3888486f86ad4086eab4e"}}