# CVE-2026-80689

## Summary

- **CVE ID:** CVE-2026-80689
- **Severity:** UNKNOWN
- **CVSS Score:** 1.01
- **CWE:** N/A
- **Published:** Aug 28, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions

mmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into
tr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map().
If these functions are invoked while mmio_trace_array is NULL (e.g. before
initialization or after disabled), accessing tr->array_buffer.buffer will
result in a NULL pointer dereference crash.

Fix this by adding an explicit NULL check for tr at the beginning of
__trace_mmiotrace_rw() and __trace_mmiotrace_map().

## Affected Products

- Linux — Linux (f984b51e0779a6dd30feedc41404013ca54e5d05)
- Linux — Linux (2.6.27)
- Linux — Linux (0)
- Linux — Linux (6.12.103)
- Linux — Linux (6.18.44)
- Linux — Linux (7.1.8)
- Linux — Linux (7.2)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a)
- [CNA](https://git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e)
- [CNA](https://git.kernel.org/stable/c/60234845142fddb27db89ebc00a65178421fb3a4)
- [CNA](https://git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2)
- [CNA](https://git.kernel.org/stable/c/dc1b1a057b3bb901f83433700e604fe0ae67c5f2)
- [CNA](https://git.kernel.org/stable/c/6aee2d478545c089dd5d055d3c9f0c7ea034fb80)
- [CNA](https://git.kernel.org/stable/c/4e4ab09db7899d7f2d2293a18adf0fa200a27e73)
- [CNA](https://git.kernel.org/stable/c/2df964d141270c40f07547b0c2e0a51e2573d46d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._