CVE-2026-68435 json
LoongArch: Fix address space mismatch in kexec command line lookup
published 2026-08-12 2 mo ago modified 2026-10-30 9 d ago also EUVD-2026-57043
- cvss
- —
- not scored
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 6.1.191, 6.6.160, 6.12.114, 6.18.42, 7.1.6, 7.2
- linux Debian 13 6.12.115-2
- linux Debian 14 7.1.6-1
debian advisories DEBIAN-CVE-2026-68435
- git.kernel.org/stable/c/742f2c0a64a7557495e831c3c112d92e308bd4ae commit
- git.kernel.org/stable/c/3b71f51fa3a247921408879eab2ddee82da8a980 commit
- git.kernel.org/stable/c/eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e commit
- git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06 commit
- git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7 commit
- git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-68435 updated cvss 5.5
kernel: LoongArch: Fix address space mismatch in kexec command line lookup
-
Red Hat Enterprise Linux 10 kernel 6.12.0-55.94.1.el10_0affected: no fix available “Fix deferred”
-
Red Hat Enterprise Linux for NVIDIA 26 kernel 6.12.0-55.94.1.el10_0affected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +2 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +30 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +84 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9not affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/742f2c0a64a7557495e831c3c112d92e308bd4ae
- git.kernel.org /stable/c/3b71f51fa3a247921408879eab2ddee82da8a980
- git.kernel.org /stable/c/eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e
- git.kernel.org /stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06
- git.kernel.org /stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7
- git.kernel.org /stable/c/485ed44db5694d8d2e5027f63ad608e705286f30
Sources
- CVE List CVE-2026-68435
- NVD CVE-2026-68435
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