Riskcovery

CVE-2023-53244

media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

State
Published
Severity
5.5 Medium
Published
Sep 15, 2025
Updated
May 11, 2026
Reserved
Sep 15, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

When the driver calls tw68_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer buf->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 tw68_risc_buffer() and the value of buf->cpu before buffer free.

Scores

CVSSScoreVectorSource
3.15.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • e15d1c12c5878b3a80d6573af1721e17264e0286 to before dcf632bca424e6ff8c8eb89c96694e7f05cd29b6Affected
  • e15d1c12c5878b3a80d6573af1721e17264e0286 to before 3c67f49a6643d973e83968ea35806c7b5ae68b56Affected
  • e15d1c12c5878b3a80d6573af1721e17264e0286 to before 3715c5e9a8f96b6ed0dcbea06da443efccac1eccAffected
  • e15d1c12c5878b3a80d6573af1721e17264e0286 to before 1634b7adcc5bef645b3666fdd564e5952a9e24e0Affected
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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