{"id":"CVE-2026-68435","summary":"LoongArch: Fix address space mismatch in kexec command line lookup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix address space mismatch in kexec command line lookup\n\nWhen searching the loaded segments for the \"kexec\" command line marker,\nthe kexec_load(2) path (file_mode == 0) passes the user-space segment\nbuffer straight to strncmp() through a bogus (char __user *) cast. This\ndereferences a user pointer in kernel context, which is wrong and is\nflagged by sparse:\n\n  arch/loongarch/kernel/machine_kexec.c:84:51: sparse: incorrect type in\n  argument 2 (different address spaces) @@ expected char const * @@ got\n  char [noderef] __user *\n\nHere copy the marker-sized prefix of each segment into a small on-stack\nbuffer with copy_from_user() before comparing, and skip segments that\nfault. The subsequent copy_from_user() that stages the full command line\ninto the safe area is left unchanged.","modified":"2026-08-13T04:02:40.261314723Z","published":"2026-08-12T00:07:23.359Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68435.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68435.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68435"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188"},{"fixed":"a94d6726ec8680a2b0c453fc782a543f68a1ea06"},{"fixed":"7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7"},{"fixed":"485ed44db5694d8d2e5027f63ad608e705286f30"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68435.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68435.json"}}],"schema_version":"1.9.0"}