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CVE-2026-80689: tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-09-14

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 kernel: 2.6.27 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2
• https://git.kernel.org/stable/c/2df964d141270c40f07547b0c2e0a51e2573d46d
• https://git.kernel.org/stable/c/4e4ab09db7899d7f2d2293a18adf0fa200a27e73
• https://git.kernel.org/stable/c/60234845142fddb27db89ebc00a65178421fb3a4
• https://git.kernel.org/stable/c/6aee2d478545c089dd5d055d3c9f0c7ea034fb80
• https://git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a
• https://git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e
• https://git.kernel.org/stable/c/dc1b1a057b3bb901f83433700e604fe0ae67c5f2

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