{"id":"CVE-2026-68435","state":"PUBLISHED","title":"LoongArch: Fix address space mismatch in kexec command line lookup","description":"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.","publishedAt":"2026-08-12T00:07:23.359Z","updatedAt":"2026-10-30T12:28:36.302Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"742f2c0a64a7557495e831c3c112d92e308bd4ae","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"3b71f51fa3a247921408879eab2ddee82da8a980","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"a94d6726ec8680a2b0c453fc782a543f68a1ea06","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"485ed44db5694d8d2e5027f63ad608e705286f30","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kernel/machine_kexec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kernel/machine_kexec.c"]}],"references":["https://git.kernel.org/stable/c/742f2c0a64a7557495e831c3c112d92e308bd4ae","https://git.kernel.org/stable/c/3b71f51fa3a247921408879eab2ddee82da8a980","https://git.kernel.org/stable/c/eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e","https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06","https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7","https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68435.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68435","state":"PUBLISHED","datePublished":"2026-08-12T00:07:23.359Z","dateUpdated":"2026-10-30T12:28:36.302Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.393Z"},"containers":{"cna":{"title":"LoongArch: Fix address space mismatch in kexec command line lookup","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"742f2c0a64a7557495e831c3c112d92e308bd4ae","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"3b71f51fa3a247921408879eab2ddee82da8a980","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"a94d6726ec8680a2b0c453fc782a543f68a1ea06","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7","versionType":"git"},{"version":"4a03b2ac06a5bcae29371866d9d11f5bfd4c9188","status":"affected","lessThan":"485ed44db5694d8d2e5027f63ad608e705286f30","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kernel/machine_kexec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kernel/machine_kexec.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/742f2c0a64a7557495e831c3c112d92e308bd4ae"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:28:36.302Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}