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Bug 864442 (CVE-2022-2652)

Summary: media-video/v4l2loopback: kernel stack memory leak via format string vulnerability
Product: Gentoo Security Reporter: John Helmert III <ajak>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: CONFIRMED ---    
Severity: minor CC: titanofold
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
URL: https://huntr.dev/bounties/1b055da5-7a9e-4409-99d7-030280d242d5
Whiteboard: B4 [upstream/ebuild]
Package list:
Runtime testing required: ---

Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-08-08 17:32:45 UTC
CVE-2022-2652:

Depending on the way the format strings in the card label are crafted it's possible to leak kernel stack memory. There is also the possibility for DoS due to the v4l2loopback kernel module crashing when providing the card label on request (reproduce e.g. with many %s modifiers in a row).

Unreleased patch: https://github.com/umlaeute/v4l2loopback/commit/e4cd225557486c420f6a34411f98c575effd43dd