CVE-2019-20386 — An issue was discovered in button_open in login/logind-button

An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the udevadm trigger command, a memory leak may occur.

01What is this vulnerability?

An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the udevadm trigger command, a memory leak may occur.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-01-21T05:12:30.000Z
• Last modified: 2025-06-09T15:40:54.578Z

09References

• github.com — https://github.com/systemd/systemd/commit/b2774a3ae692113e1f47a336a6c09bac9cfb49…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20200210-0002/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00014.html
• usn.ubuntu.com — https://usn.ubuntu.com/4269-1/
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…