# CVE-2023-53458: linux: In the Linux kernel, the following vulnerability has been resolved:  media: cx23885: Fix a null-ptr-deref bug in buff...

CVE-2023-53458 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53458, released October 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-53458
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()  When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered.  This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.  We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-53458](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53458.md) | Oct 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53458](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53458.md) | Oct 1, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53458](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53458.md) | Oct 1, 2025 |

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