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Fencer Vulns
high 7.3

CVE-2022-2652 json

Use of Externally-Controlled Format String in umlaeute/v4l2loopback

published 2022-08-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-34898

cvss
7.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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).

Patch / fix

  • umlaeute umlaeute/v4l2loopback 0.12.6
  • v4l2loopback Debian 14, Debian 13, Debian 12 0.12.7-1

debian advisories DEBIAN-CVE-2022-2652

  • v4l2loopback openSUSE Leap 15.3 0.12.5-lp153.2.5.1
  • v4l2loopback openSUSE Leap 15.4 0.12.5-lp154.3.3.1

opensuse advisories openSUSE-SU-2022:10160-1openSUSE-SU-2022:10159-1

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/1b055da5-7a9e-4409-99d7-030280d242d5 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.3 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L
NVD 3.1 6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

Affected products

  • umlaeute umlaeute/v4l2loopback

Classification

Weakness
  • CWE-134 Use of Externally-Controlled Format String

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.