CVE-2026-80756

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.

References

• https://git.kernel.org/stable/c/1059789ae9f99cbbe3a78e361e9c0976beb5958b
• https://git.kernel.org/stable/c/1acc317d67a755a45e32419a15d70e403fa43f0e
• https://git.kernel.org/stable/c/1b4ff94ae7c580c880291519fb0e3e2bd075beef
• https://git.kernel.org/stable/c/219c96de5d9b6b4af7e8576ad897b774cc3ee9a7
• https://git.kernel.org/stable/c/2d29983104f06f5b0babcd5a25a0f0408272cd27