CVE-2026-68435
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.
Affected versions
Linux kernel versions
6.1
and later are affected. Fixed in
6.18.42,
7.1.6,
7.2
and their respective stable series.
References
3 totalFrequently asked questions
-
What is CVE-2026-68435?
CVE-2026-68435 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.1 onward and has been patched in 6.18.42, 7.1.6 and 7.2. CVE-2026-68435 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2026-68435?
Yes. CVE-2026-68435 has been patched. Fixed versions include 6.18.42, 7.1.6 and 7.2. If you are running Linux kernel 6.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2026-68435 actively exploited?
No. CVE-2026-68435 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.