# CVE-2022-2652: v4l2loopback: Depending on the way the format strings in the card label are crafted it's possible to leak kernel stack memory

CVE-2022-2652 is fixed in v4l2loopback on 1 platform, first by DEBIAN-CVE-2022-2652, released August 4, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-2652
- Priority: Routine
- CVSS: 6.0 (medium)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 4, 2022

## Description

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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | v4l2loopback Debian 12.15 (bookworm) | 0.12.7-1 | [DEBIAN-CVE-2022-2652](https://patchblox.com/security/data/fix/linux/debian-cve-2022-2652.md) | Aug 4, 2022 |
| Linux | v4l2loopback Debian 13.5 (trixie) | 0.12.7-1 | [DEBIAN-CVE-2022-2652](https://patchblox.com/security/data/fix/linux/debian-cve-2022-2652.md) | Aug 4, 2022 |
| Linux | v4l2loopback Debian 14 | 0.12.7-1 | [DEBIAN-CVE-2022-2652](https://patchblox.com/security/data/fix/linux/debian-cve-2022-2652.md) | Aug 4, 2022 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.