CVE-2026-80756

In the Linux kernel, the following vulnerability has been resolved:

selinux: do not cancel a policy conversion that never started

selwriteload() calls selinuxpolicycancel() when selmakepolicynodes() fails, and that helper dereferences the outgoing policy to cancel its sidtab conversion. On the first policy load there is no outgoing policy: securityloadpolicy() 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 selinuxpolicy_cancel(), reached from a write(2) to /sys/fs/selinux/load.

Skip the cancel when there is no old policy, mirroring the check securityloadpolicy() already makes before it converts.