CVE-2026-80652: Linux kernel · crypto: ccp – Treat zero-length cert chain as query for blob lengths
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ef8c9dacda2871accd64e3eda951fef6b788b1ea : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:41 UTC
Rated Low 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 ef8c9dacda2871accd64e3eda951fef6b788b1ea, ee717e73ab47253c82c134c342e32fcdfcfccd87, d88071a6ce091272726bedda26c105b85b23705f +5
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Aug 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
This vulnerability has been fixed in multiple Linux kernel commits. Users should update their Linux kernel to a version that includes these fixes. If running with CONFIG_DEBUG_VIRTUAL=y, upgrading is critical to avoid kernel crashes. For typical production environments without this debug configuration, the issue is benign. No additional mitigation is required beyond applying the official kernel patches.
Description
A vulnerability in the Linux kernel crypto CCP driver mishandles zero-length certificate chain buffers during PDH export operations. This mishandling triggers a kernel BUG_ON() when CONFIG_DEBUG_VIRTUAL=y is enabled, causing a kernel crash due to an invalid physical address calculation. Outside of this debug configuration, the bug is benign as the physical address calculation is harmless and the PSP prevents memory corruption.
References
- git.kernel.org/stable/c/1c587f30c6242cc37b3d6ee6d91daef84e51633f (opens in a new tab)
- git.kernel.org/stable/c/13b4d5e055d344e34b864bced0a591ceaac7ad81 (opens in a new tab)
- git.kernel.org/stable/c/94344bc7c9d70b04be718d841b92873aa3ea8191 (opens in a new tab)
- git.kernel.org/stable/c/50c3c7df4f26d36b30bc950a7d780f7029fd52f8 (opens in a new tab)
- git.kernel.org/stable/c/ee717e73ab47253c82c134c342e32fcdfcfccd87 (opens in a new tab)
- git.kernel.org/stable/c/21650fe221ea9b72809140b691589dde8bff3eab (opens in a new tab)
- git.kernel.org/stable/c/d88071a6ce091272726bedda26c105b85b23705f (opens in a new tab)
- git.kernel.org/stable/c/ef8c9dacda2871accd64e3eda951fef6b788b1ea (opens in a new tab)