{"id":"CVE-2026-98403","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.","modified":"2026-10-15T02:47:35.032478640Z","published":"2026-10-14T13:26:02.916Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98403.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af9866021a00ab9eeacf0c33ee73f3d134b4ed70"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98403.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98403"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5ecb2da660ab8eddafe059a6a8a708465db89ca2"},{"fixed":"af9866021a00ab9eeacf0c33ee73f3d134b4ed70"},{"fixed":"73eec5a0d55916d7e1115f5d03a7ffc06d6215cf"},{"fixed":"8d11bfec8666f8409fac9072e9c25b691d3e30ac"},{"fixed":"d76181dfabdaa720703167393704efacba343442"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98403.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98403.json"}}],"schema_version":"1.9.0"}