Riskcovery

CVE-2023-53458

media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()

State
Published
Severity
Not scored
Published
Oct 1, 2025
Updated
May 11, 2026
Reserved
Oct 1, 2025

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4d63a25c4523b5d18e5307897d56aff785f43bf5 to before f0a06203f2fe63f04311467200c99c4ee1926578Affected
  • 4d63a25c4523b5d18e5307897d56aff785f43bf5 to before 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1Affected
  • 4d63a25c4523b5d18e5307897d56aff785f43bf5 to before 5b8e5e28e85a546dfccc3895befe0e823fdd7c89Affected
  • 4d63a25c4523b5d18e5307897d56aff785f43bf5 to before 47e8b73bc35d7c54642f78e498697692f6358996Affected
LinuxLinux
  • 3.18Affected
  • before 3.18Not affected
  • 5.15.113 through 5.15.*Not affected
  • 6.1.30 through 6.1.*Not affected
  • 6.3.4 through 6.3.*Not affected
  • 6.4 and laterNot affected

References

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