CVE-2026-80689: Linux kernel · tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in dc1b1a057b3bb901f83433700e604fe0ae67c5f2 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:40 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 dc1b1a057b3bb901f83433700e604fe0ae67c5f2, a20a0010eb6485f60cd64e15ebc85a4bd388642e, 60234845142fddb27db89ebc00a65178421fb3a4 +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
A fix has been applied in the Linux kernel source code as indicated by multiple fixed commit versions. Users should update to a kernel version including these fixes to mitigate the issue. No additional mitigation is required beyond applying the official patch.
Description
A null pointer dereference vulnerability was identified in the Linux kernel's tracing/mmiotrace subsystem. The issue occurs because the logging functions did not check if the mmio_trace_array pointer was NULL before dereferencing it, which could cause a kernel crash. This was fixed by adding explicit NULL checks in the affected functions.
References
- git.kernel.org/stable/c/dc1b1a057b3bb901f83433700e604fe0ae67c5f2 (opens in a new tab)
- git.kernel.org/stable/c/6aee2d478545c089dd5d055d3c9f0c7ea034fb80 (opens in a new tab)
- git.kernel.org/stable/c/4e4ab09db7899d7f2d2293a18adf0fa200a27e73 (opens in a new tab)
- git.kernel.org/stable/c/2df964d141270c40f07547b0c2e0a51e2573d46d (opens in a new tab)
- git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a (opens in a new tab)
- git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e (opens in a new tab)
- git.kernel.org/stable/c/60234845142fddb27db89ebc00a65178421fb3a4 (opens in a new tab)
- git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2 (opens in a new tab)