Published: 21/09/2022 Updated: 25/03/2024

CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8

VMScore: 0

In drivers/media/dvb-core/dmxdev.c in the Linux kernel up to and including 5.19.10, there is a use-after-free caused by refcount races, affecting dvb_demux_open and dvb_dmxdev_release.

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DescriptionA use-after-free flaw was found in the Linux kernel’s dvb-core subsystem (DVB API used by Digital TV devices) in how a user physically removed a USB device (such as a DVB demultiplexer device) while running malicious code This flaw allows a local user to crash or potentially escalate their privileges on the systemA use-after-f ...

use-after-free when dvb_demux_open() is called between the two syncs of dvbdev->users and dvr_dvbdev->users in dvb_dmxdev_release() ...

Vulnerability Details for CVE-2022-41218

Introduction This vulnerability is a race condition vulnerability that occurs in drivers/media/dvb-core/dmxdevc Therefore, a race condition may occur in the usb device driver using this dmxdev This vulnerability could be used to trigger 3 UAFs Vulnerability 1 vmalloc UAF write First, the order of the exploit is as follows(I debugged using drivers/media/usb/ttusb-dec/ttusb_

CWE-416 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/media/dvb-core/dmxdev.c http://www.openwall.com/lists/oss-security/2022/09/23/4 http://www.openwall.com/lists/oss-security/2022/09/24/1 http://www.openwall.com/lists/oss-security/2022/09/24/2 https://www.debian.org/security/2023/dsa-5324 https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html https://lore.kernel.org/all/20220908132754.30532-1-tiwai%40suse.de/https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fd3d91ab1c6ab0628fe642dd570b56302c30a792 https://www.debian.org/security/2023/dsa-5324 https://nvd.nist.gov https://github.com/V4bel/CVE-2022-41218

CVE-2022-41218

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