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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80689
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:54 UTC
Updated2026-08-28 08:16:54 UTC
DescriptionIn 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().

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.062670000 (date 2026-08-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f984b51e0779a6dd30feedc41404013ca54e5d05 876014b4eeb927146430e7591cf959a7ceb8d64a git Not specified
CNA Linux Linux affected f984b51e0779a6dd30feedc41404013ca54e5d05 a20a0010eb6485f60cd64e15ebc85a4bd388642e git Not specified
CNA Linux Linux affected f984b51e0779a6dd30feedc41404013ca54e5d05 60234845142fddb27db89ebc00a65178421fb3a4 git Not specified
CNA Linux Linux affected f984b51e0779a6dd30feedc41404013ca54e5d05 12b80cdbc54cf615b4717a4e8180063408091ea2 git Not specified
CNA Linux Linux affected 2.6.27 Not specified
CNA Linux Linux unaffected 2.6.27 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/60234845142fddb27db89ebc00a65178421fb3a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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