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:	Vulnerabilities	Assignee:	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

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