CVE-2026-80689
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().
How to fix
- Linux Linuxdc1b1a057b3bb901f83433700e604fe0ae67c5f2, 6aee2d478545c089dd5d055d3c9f0c7ea034fb80, 4e4ab09db7899d7f2d2293a18adf0fa200a27e73, 2df964d141270c40f07547b0c2e0a51e2573d46d, 876014b4eeb927146430e7591cf959a7ceb8d64a, a20a0010eb6485f60cd64e15ebc85a4bd388642e, 60234845142fddb27db89ebc00a65178421fb3a4, 12b80cdbc54cf615b4717a4e8180063408091ea2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < dc1b1a057b3bb901f83433700e604fe0ae67c5f2, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 6aee2d478545c089dd5d055d3c9f0c7ea034fb80, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 4e4ab09db7899d7f2d2293a18adf0fa200a27e73, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 2df964d141270c40f07547b0c2e0a51e2573d46d, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 876014b4eeb927146430e7591cf959a7ceb8d64a, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < a20a0010eb6485f60cd64e15ebc85a4bd388642e, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 60234845142fddb27db89ebc00a65178421fb3a4, f984b51e0779a6dd30feedc41404013ca54e5d05 ≤ v < 12b80cdbc54cf615b4717a4e8180063408091ea2, 2.6.27 | dc1b1a057b3bb901f83433700e604fe0ae67c5f2, 6aee2d478545c089dd5d055d3c9f0c7ea034fb80, 4e4ab09db7899d7f2d2293a18adf0fa200a27e73, 2df964d141270c40f07547b0c2e0a51e2573d46d, 876014b4eeb927146430e7591cf959a7ceb8d64a, a20a0010eb6485f60cd64e15ebc85a4bd388642e, 60234845142fddb27db89ebc00a65178421fb3a4, 12b80cdbc54cf615b4717a4e8180063408091ea2 |
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