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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| umlaeute | umlaeute/v4l2loopback | unspecified – < 0.12.6 | 0.12.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | v4l2loopback | 0.12.7-1 | — |
| Debian 13 | v4l2loopback | 0.12.7-1 | — |
| Debian 12 | v4l2loopback | 0.12.7-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | v4l2loopback | No fix yet | — |
| Ubuntu 26.04 LTS | v4l2loopback | No fix yet | — |
| Ubuntu 25.10 | v4l2loopback | No fix yet | — |
| Ubuntu 24.04 LTS | v4l2loopback | No fix yet | — |
| Ubuntu 22.04 LTS | v4l2loopback | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | v4l2loopback | No fix yet | — |
| Ubuntu 18.04 LTS | v4l2loopback | No fix yet | — |
| Ubuntu 16.04 LTS | v4l2loopback | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | v4l2loopback | 0.12.5-lp154.3.3.1 | openSUSE-SU-2022:10159-1 |
| openSUSE Leap 15.3 | v4l2loopback | 0.12.5-lp153.2.5.1 | openSUSE-SU-2022:10160-1 |
Advisories 2
- openSUSE-SU-2022:10160-1 Security update for v4l2loopback SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:10159-1 Security update for v4l2loopback SUSE / openSUSE Security Updates · Feb 4, 2026