Answer in brief
CVE-2023-53458 records a Medium severity (CVSS 5.5) vulnerability in media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4d63a25c4523b5d18e5307897d56aff785f43bf5 <f0a06203f2fe63f04311467200c99c4ee1926578 || >=4d63a25c4523b5d18e5307897d56aff785f43bf5 <6738841f6fcf23e9fc30e2449f32fc84ee19c6f1 || >=4d63a25c4523b5d18e5307897d56aff785f43bf5 <5b8e5e28e85a546dfccc3895befe0e823fdd7c89 || >=4d63a25c4523b5d18e5307897d56aff785f43bf5 <47e8b73bc35d7c54642f78e498697692f6358996 | f0a06203f2fe63f04311467200c99c4ee1926578, 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1, 5b8e5e28e85a546dfccc3895befe0e823fdd7c89, 47e8b73bc35d7c54642f78e498697692f6358996 |
| Linux/Linuxgeneric | 3.18 | Not reported |
Published upstream
Oct 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.