CVE-2026-68435 is a vulnerability in Linux Kernel
Published on August 12, 2026
LoongArch: Fix address space mismatch in kexec command line lookup
In 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.
Products Associated with CVE-2026-68435
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Affected Versions
Linux:- Version 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 and below a94d6726ec8680a2b0c453fc782a543f68a1ea06 is affected.
- Version 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 and below 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7 is affected.
- Version 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 and below 485ed44db5694d8d2e5027f63ad608e705286f30 is affected.
- Version 6.1 is affected.
- Before 6.1 is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc5, <= * is unaffected.