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CVE-2026-80756

Unknown

Last modified

CVE-2026-80756 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < 2d29983104f06f5b0babcd5a25a0f0408272cd27; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < a4f182f8715cb0819445f0850cd5436828f4bafc; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < 1059789ae9f99cbbe3a78e361e9c0976beb5958b; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < 1acc317d67a755a45e32419a15d70e403fa43f0e; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < a42932c6aa33d0aac683cacdf1ec7009b955ba5d; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < 1b4ff94ae7c580c880291519fb0e3e2bd075beef; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < 219c96de5d9b6b4af7e8576ad897b774cc3ee9a7; >= 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972, < e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e
LinuxLinux5.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80756?
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.
How severe is CVE-2026-80756?
Severity scoring for CVE-2026-80756 is pending analysis.
How do I fix CVE-2026-80756?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST