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

CVE-2026-80689 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-80689, released August 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-80689
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel-livepatch-6.12.103-127.188 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel-livepatch-6.18.44-99.149 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-80689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80689.md) | Aug 29, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.105-1 | [DEBIAN-CVE-2026-80689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80689.md) | Aug 29, 2026 |
| Linux | linux Debian 14 | 7.1.8-1 | [DEBIAN-CVE-2026-80689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80689.md) | Aug 29, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.107-1~deb12u1 | [DEBIAN-CVE-2026-80689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80689.md) | Aug 29, 2026 |
| Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.103-127.188.amzn2023 | [ALAS2023-2026-2110](https://patchblox.com/security/data/fix/linux/alas2023-2026-2110.md) | Aug 31, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.44-99.149.amzn2023 | [ALAS2023-2026-2106](https://patchblox.com/security/data/fix/linux/alas2023-2026-2106.md) | Aug 31, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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