# CVE-2023-20928: linux: In binder_vma_close of binder.c, there is a possible use after free due to improper locking

CVE-2023-20928 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-20928, released January 26, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-20928
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 26, 2023

## Description

In binder_vma_close of binder.c, there is a possible use after free due to improper locking. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-254837884References: Upstream kernel

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.19.6-1 | [DEBIAN-CVE-2023-20928](https://patchblox.com/security/data/fix/linux/debian-cve-2023-20928.md) | Jan 26, 2023 |
| Linux | linux Debian 13.5 (trixie) | 5.19.6-1 | [DEBIAN-CVE-2023-20928](https://patchblox.com/security/data/fix/linux/debian-cve-2023-20928.md) | Jan 26, 2023 |
| Linux | linux Debian 14 | 5.19.6-1 | [DEBIAN-CVE-2023-20928](https://patchblox.com/security/data/fix/linux/debian-cve-2023-20928.md) | Jan 26, 2023 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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