Linux Kernel up to 5.18.7 uvcg_video_pump information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 5.18.7. Affected by this vulnerability is the function uvcg_video_pump. The manipulation leads to information disclosure. This vulnerability is traded as CVE-2022-49686. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.18.7. It has been rated as problematic. This issue affects the function uvcg_video_pump. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix list double add in uvcg_video_pump A panic can occur if the endpoint becomes disabled and the uvcg_video_pump adds the request back to the req_free list after it has already been queued to the endpoint. The endpoint complete will add the request back to the req_free list. Invalidate the local request handle once it's been queued. [ 246.796704][T13726] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 0) [ 246.797078][ T26] list_add double add: new=ffffff878bee5c40, prev=ffffff878bee5c40, next=ffffff878b0f0a90. [ 246.797213][ T26] ------------[ cut here ]------------ [ 246.797224][ T26] kernel BUG at lib/list_debug.c:31! [ 246.807073][ T26] Call trace: [ 246.807180][ T26] uvcg_video_pump+0x364/0x38c [ 246.807366][ T26] process_one_work+0x2a4/0x544 [ 246.807394][ T26] worker_thread+0x350/0x784 [ 246.807442][ T26] kthread+0x2ac/0x320

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2022-49686 since 02/26/2025. The exploitation is known to be difficult. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 248436 (Linux Distros Unpatched Vulnerability : CVE-2022-49686), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.18.8 eliminates this vulnerability. Applying the patch d95ac8b920de1d39525fadc408ce675697626ca6/96163f835e65f8c9897487fac965819f0651d671 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (248436). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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