CVE-2025-68177 cpufreq/longhaul: handle NULL policy in longhaul_exit
A NULL pointer dereference in the Linux kernel cpufreq longhaul driver can cause a system crash or panic, requiring a kernel patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68177?
CVE-2025-68177 is a vulnerability in Linux, published on 16 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
cpufreq/longhaul: handle NULL policy in longhaul_exit
longhaul_exit() was calling cpufreq_cpu_get(0) without checking for a NULL policy pointer. On some systems, this could lead to a NULL dereference and a kernel warning or panic.
This patch adds a check using unlikely() and returns early if the policy is NULL.
Bugzilla: #219962
Which versions are affected by CVE-2025-68177?
How do I fix CVE-2025-68177?
Apply the vendor's patch.
Is CVE-2025-68177 being exploited?
There is no known exploitation of CVE-2025-68177 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68177, DEBIAN-CVE-2025-68177, GHSA-q4w5-8ph4-32c6, ROOT-OS-DEBIAN-12-CVE-2025-68177, ROOT-OS-DEBIAN-13-CVE-2025-68177, ROOT-OS-UBUNTU-2204-CVE-2025-68177 and 2 more.