CVE-2026-68435 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 kexecload2 path filemode == 0 passes the user-space segment buffer straight to strncmp...