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
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.270, 5.15.221, 6.1.188, 6.12.103, 6.18.44, 6.6.157, 7.1.8
- CVEs
- CVE-2026-80689
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:16 UTC · Revision 1
Source evidence
tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions
core-osv · Original sourcePublished 28 Aug 2026, 06:52 UTC
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().
osv:CVE-2026-80689
Kernel
Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.103, 6.18.44, 7.1.8
Complete source record
{
"id": "5921421bff964c47e84f9f47c058b61a3415d024a7bbbe1da4191e5e06fbed04",
"url": "https://osv.dev/vulnerability/CVE-2026-80689",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions",
"summary": "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().",
"evidence": "osv:CVE-2026-80689",
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"modified": "2026-10-28T02:30:24.737854981Z",
"provider": "osv",
"references": [
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80689.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-80689",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80689.json"
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},
"related_cves": [
{
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 491530,
"published_at": "2026-08-28T06:52:53.724+00:00"
}