{"id":"CVE-2026-68435","title":"LoongArch: Fix address space mismatch in kexec command line lookup","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 3b71f51fa3a247921408879eab2ddee82da8a980","Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e","Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < a94d6726ec8680a2b0c453fc782a543f68a1ea06","Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7","Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 485ed44db5694d8d2e5027f63ad608e705286f30","Linux 6.1"],"published":"2026-08-12","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:44:08.300Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68435","references":[{"url":"https://git.kernel.org/stable/c/3b71f51fa3a247921408879eab2ddee82da8a980"},{"url":"https://git.kernel.org/stable/c/eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e"},{"url":"https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06"},{"url":"https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7"},{"url":"https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30"}],"tags":["cve.org"],"epss":0.00206,"epssPercentile":0.10103,"ingestedAt":"2026-10-21T12:48:53.598Z","slug":"CVE-2026-68435","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 3b71f51fa3a247921408879eab2ddee82da8a980`\n- `Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e`\n- `Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < a94d6726ec8680a2b0c453fc782a543f68a1ea06`\n- `Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7`\n- `Linux >= 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 < 485ed44db5694d8d2e5027f63ad608e705286f30`\n- `Linux 6.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}