{"id":"CVE-2026-98403","revision":"3c8cc3106be344fd9772178afa694a33","records":[{"revision":"3c8cc3106be344fd9772178afa694a33","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98403","aliases":[],"title":"s390/boot: Avoid IPL parameter append past command line","description":"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.","state":0,"publishedAt":"2026-10-14T13:26:02.916+00:00","modifiedAt":"2026-10-19T09:18:56.682+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/s390/boot/ipl_parm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5ecb2da660ab8eddafe059a6a8a708465db89ca2\",\n                            \"lessThan\": \"af9866021a00ab9eeacf0c33ee73f3d134b4ed70\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5ecb2da660ab8eddafe059a6a8a708465db89ca2\",\n                            \"lessThan\": \"73eec5a0d55916d7e1115f5d03a7ffc06d6215cf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5ecb2da660ab8eddafe059a6a8a708465db89ca2\",\n                            \"lessThan\": \"8d11bfec8666f8409fac9072e9c25b691d3e30ac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5ecb2da660ab8eddafe059a6a8a708465db89ca2\",\n                            \"lessThan\": \"d76181dfabdaa720703167393704efacba343442\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/s390/boot/ipl_parm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/af9866021a00ab9eeacf0c33ee73f3d134b4ed70","https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf","https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac","https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98403","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98403","identifiers":["CVE-2026-98403"]},"retained":false,"historicalAffected":[]}],"coverage":[]}