Improper initialization in Linux kernel - CVE-2026-97904

Vulnerability details

The vulnerability allows a local user to trigger access to an uninitialized semaphore.

The vulnerability exists due to improper initialization in cpufreq_policy_alloc() when accessing policy sysfs attributes during policy creation. A local user can access a policy sysfs attribute before policy->rwsem is initialized to trigger access to an uninitialized semaphore.

Affected software

How to mitigate CVE-2026-97904

External References

• https://git.kernel.org/stable/c/27c9b491bf7604e83b50c3bbfa18a30266ff345f
• https://git.kernel.org/stable/c/2cee937f779f69b195b37bbec1e888da9bfe9d58
• https://git.kernel.org/stable/c/3e5d1bf4bd687beb2cb4e32a07af695455925588
• https://git.kernel.org/stable/c/dc11263cb05ed519758fd135fe08d611bad1f241

Related Security Bulletins

• Improper initialization in Linux kernel cpufreq driver