CVE-2026-80689 is a vulnerability in Linux Kernel
Published on August 28, 2026
tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions
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().
Products Associated with CVE-2026-80689
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Affected Versions
Linux:- Version f984b51e0779a6dd30feedc41404013ca54e5d05 and below 876014b4eeb927146430e7591cf959a7ceb8d64a is affected.
- Version f984b51e0779a6dd30feedc41404013ca54e5d05 and below a20a0010eb6485f60cd64e15ebc85a4bd388642e is affected.
- Version f984b51e0779a6dd30feedc41404013ca54e5d05 and below 60234845142fddb27db89ebc00a65178421fb3a4 is affected.
- Version f984b51e0779a6dd30feedc41404013ca54e5d05 and below 12b80cdbc54cf615b4717a4e8180063408091ea2 is affected.
- Version 2.6.27 is affected.
- Before 2.6.27 is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.