# CVE-2026-68435: linux: In the Linux kernel, the following vulnerability has been resolved:  LoongArch: Fix address space mismatch in kexec c...

CVE-2026-68435 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-68435, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-68435
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 12, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-68435](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68435.md) | Aug 13, 2026 |
| Linux | linux Debian 14 | 7.1.6-1 | [DEBIAN-CVE-2026-68435](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68435.md) | Aug 13, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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