Bug 2425178 (CVE-2022-50757)

Summary: CVE-2022-50757 kernel: Linux kernel: Denial of Service or Information Disclosure in `camss` media driver
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's media subsystem, specifically within the `camss` driver. When streaming fails to start, such as due to a link validation issue, the system does not properly clean up received buffers. This oversight can lead to a kernel warning, potentially resulting in a denial of service (DoS) or information disclosure, as indicated by the high impact on confidentiality, integrity, and availability.
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Description OSIDB Bzimport 2025-12-24 14:08:53 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: camss: Clean up received buffers on failed start of streaming

It is required to return the received buffers, if streaming can not be
started. For instance media_pipeline_start() may fail with EPIPE, if
a link validation between entities is not passed, and in such a case
a user gets a kernel warning:

  WARNING: CPU: 1 PID: 520 at drivers/media/common/videobuf2/videobuf2-core.c:1592 vb2_start_streaming+0xec/0x160
  <snip>
  Call trace:
   vb2_start_streaming+0xec/0x160
   vb2_core_streamon+0x9c/0x1a0
   vb2_ioctl_streamon+0x68/0xbc
   v4l_streamon+0x30/0x3c
   __video_do_ioctl+0x184/0x3e0
   video_usercopy+0x37c/0x7b0
   video_ioctl2+0x24/0x40
   v4l2_ioctl+0x4c/0x70

The fix is to correct the error path in video_start_streaming() of camss.
Comment 1 Alexander B 2025-12-24 20:48:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122454-CVE-2022-50757-15f0@gregkh/T