CVE-2023-53244

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe15d1c12c5878b3a80d6573af1721e17264e0286 < dcf632bca424e6ff8c8eb89c96694e7f05cd29b6affected
LinuxLinuxe15d1c12c5878b3a80d6573af1721e17264e0286 < 3c67f49a6643d973e83968ea35806c7b5ae68b56affected
LinuxLinuxe15d1c12c5878b3a80d6573af1721e17264e0286 < 3715c5e9a8f96b6ed0dcbea06da443efccac1eccaffected
LinuxLinuxe15d1c12c5878b3a80d6573af1721e17264e0286 < 1634b7adcc5bef645b3666fdd564e5952a9e24e0affected
LinuxLinux3.18affected
LinuxLinux0 < 3.18unaffected
LinuxLinux5.15.113 <= 5.15.*unaffected
LinuxLinux6.1.30 <= 6.1.*unaffected
LinuxLinux6.3.4 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References