# CVE-2026-45989: of: unittest: fix use-after-free in testdrv_probe()

CVE-2026-45989 is fixed in 37 products on 1 platform, first by ALAS2023-2026-1753, released May 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-45989
- Priority: High
- CVSS: 7.8 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 25, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45989

## Description

In the Linux kernel, the following vulnerability has been resolved:  of: unittest: fix use-after-free in testdrv_probe()  The function testdrv_probe() retrieves the device_node from the PCI device, applies an overlay, and then immediately calls of_node_put(dn). This releases the reference held by the PCI core, potentially freeing the node if the reference count drops to zero. Later, the same freed pointer 'dn' is passed to of_platform_default_populate(), leading to a use-after-free.  The reference to pdev->dev.of_node is owned by the device model and should not be released by the driver. Remove the erroneous of_node_put() to prevent premature freeing.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel-livepatch-6.12.88-119.157 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel-livepatch-6.18.30-61.116 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.86-1 | [DEBIAN-CVE-2026-45989](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45989.md) | May 27, 2026 |
| Linux | linux Debian 14 | 7.0.4-1 | [DEBIAN-CVE-2026-45989](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45989.md) | May 27, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.88-119.157.amzn2023 | [ALAS2023-2026-1753](https://patchblox.com/security/data/fix/linux/alas2023-2026-1753.md) | May 25, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |

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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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