CVE-2026-80867: Linux kernel · alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ed2cd1fee0ed16a1c2dff49175e65c641eb8ae2b : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:34 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in ed2cd1fee0ed16a1c2dff49175e65c641eb8ae2b, c3234efe21d4198945492cf7dba6859476f0f6ff, 257b55dc3d18d7ef01f62a8ff7317871f7597e28 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix has been implemented and merged into the Linux kernel source, adding the security_locked_down() check to pci_mmap_resource() for Alpha. Systems running the affected version (=5.4) should update to a kernel including the fix identified by the listed commit hashes. No additional mitigation is required once the patch is applied.
Description
A vulnerability in the Linux kernel's Alpha architecture PCI subsystem allowed userspace to mmap PCI BARs without checking the kernel lockdown state. This missing check could enable unauthorized access to PCI resources when the kernel lockdown mode is enabled. The issue has been fixed by adding the security_locked_down() check to pci_mmap_resource() for Alpha, aligning it with the generic PCI implementation.
References
- git.kernel.org/stable/c/6e368485a1ac19fbde0a8b6a332d4545ae72a8ac (opens in a new tab)
- git.kernel.org/stable/c/ed2cd1fee0ed16a1c2dff49175e65c641eb8ae2b (opens in a new tab)
- git.kernel.org/stable/c/c3234efe21d4198945492cf7dba6859476f0f6ff (opens in a new tab)
- git.kernel.org/stable/c/4de5ff924c0a8ef8166c1a68af9087826e1e8d61 (opens in a new tab)
- git.kernel.org/stable/c/85f966b1120874fe530edec50d28373ceb06ebcd (opens in a new tab)
- git.kernel.org/stable/c/94defb18ac792fd16407d5a52ad0d3f5055c4b43 (opens in a new tab)
- git.kernel.org/stable/c/257b55dc3d18d7ef01f62a8ff7317871f7597e28 (opens in a new tab)
- git.kernel.org/stable/c/78a228f0aa0e9eba31955950c8a40a9945e2c8bb (opens in a new tab)