LoongArch: Fix address space mismatch in kexec command line lookup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68435
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 00:17:43 UTC
Updated2026-08-12 00:17:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix address space mismatch in kexec command line lookup When searching the loaded segments for the "kexec" command line marker, the kexec_load(2) path (file_mode == 0) passes the user-space segment buffer straight to strncmp() through a bogus (char __user *) cast. This dereferences a user pointer in kernel context, which is wrong and is flagged by sparse: arch/loongarch/kernel/machine_kexec.c:84:51: sparse: incorrect type in argument 2 (different address spaces) @@ expected char const * @@ got char [noderef] __user * Here copy the marker-sized prefix of each segment into a small on-stack buffer with copy_from_user() before comparing, and skip segments that fault. The subsequent copy_from_user() that stages the full command line into the safe area is left unchanged.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.051540000 (date 2026-08-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 a94d6726ec8680a2b0c453fc782a543f68a1ea06 git Not specified
CNA Linux Linux affected 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7 git Not specified
CNA Linux Linux affected 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 485ed44db5694d8d2e5027f63ad608e705286f30 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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