CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's SELinux policy loading mechanism, specifically during the initial policy load when a failure occurs while building the SELinux filesystem tree. This results in a NULL dereference in the `selinux_policy_cancel()` function, potentially leading to a denial of service. Organizations utilizing Linux systems with SELinux enabled should prioritize addressing this issue to ensure system stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: selinux: do not cancel a policy conversion that never started sel_write_load() calls selinux_policy_cancel() when sel_make_policy_nodes() fails, and that helper dereferences the outgoing policy to cancel its sidtab conversion. On the first policy load there is no outgoing policy: security_load_policy() returns early for that case, before it converts anything, and state->policy is still NULL. A first load that fails while building the selinuxfs tree therefore takes a NULL dereference in selinux_policy_cancel(), reached from a write(2) to /sys/fs/selinux/load. Skip the cancel when there is no old policy, mirroring the check security_load_policy() already makes before it converts.