CVE-2026-46302
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the restriction allowing only a single open of /sys/fs/selinux/policy has been removed. Previously, any process could block others from reading the SELinux policy, posing a security issue. The patch eliminates the policy_opened flag and shortens the critical section with the policy mutex.
Risk Assessment
The risk involves a potential DoS attack by a local user who can block access to the SELinux policy, preventing other processes (e.g., audit tools) from reading it.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing this fix to eliminate the vulnerability to blocking access to the SELinux policy.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: selinux: allow multiple opens of /sys/fs/selinux/policy Currently there can only be a single open of /sys/fs/selinux/policy at any time. This allows any process to block any other process from reading the kernel policy. The original motivation seems to have been a mix of preventing an inconsistent view of the policy size and preventing userspace from allocating kernel memory without bound, but this is arguably equally bad. Eliminate the policy_opened flag and shrink the critical section that the policy mutex is held. While we are making changes here, drop a couple of extraneous BUG_ONs.