CVE-2026-80756: Linux kernel · selinux: do not cancel a policy conversion that never started
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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
- ubuntu.com/security/CVE-2026-80756 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80756 (opens in a new tab)
- git.kernel.org/linus/e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e (opens in a new tab)
- git.kernel.org/stable/c/1059789ae9f99cbbe3a78e361e9c0976beb5958b (opens in a new tab)
- git.kernel.org/stable/c/1acc317d67a755a45e32419a15d70e403fa43f0e (opens in a new tab)
- git.kernel.org/stable/c/1b4ff94ae7c580c880291519fb0e3e2bd075beef (opens in a new tab)
- git.kernel.org/stable/c/219c96de5d9b6b4af7e8576ad897b774cc3ee9a7 (opens in a new tab)
- git.kernel.org/stable/c/2d29983104f06f5b0babcd5a25a0f0408272cd27 (opens in a new tab)
- git.kernel.org/stable/c/a42932c6aa33d0aac683cacdf1ec7009b955ba5d (opens in a new tab)
- git.kernel.org/stable/c/a4f182f8715cb0819445f0850cd5436828f4bafc (opens in a new tab)
- git.kernel.org/stable/c/e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e (opens in a new tab)