CVE-2026-68435 - LoongArch: Fix address space mismatch in kexec command line lookup

CVE-2026-68435 - LoongArch: Fix address space mismatch in kexec command line lookup

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/12/2026 - 04:25
CVE ID :CVE-2026-68435
Published : Aug. 12, 2026, 12:17 a.m. | 1 hour, 10 minutes ago
Description :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.
Severity: 0.0 | NA
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