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Vulnerability record · CVE-2016-7796 · published 13 October 2016

CVE-2016-7796: Systemd project systemd improper input validation vulnerability

Systemd Project · Systemd

The manager_dispatch_notify_fd function in systemd allows local users to cause a denial of service (system hang) via a zero-length message received over a notify socket, which causes an error to be returned and the notification handler to be disabled.

5.5 CVSS 3.0 Medium EPSS 0.86% · top 43.3% CWE-20 · Improper input validation
5.5CVSS 3.0 base score, v2 4.9
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
20References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

The manager_dispatch_notify_fd function in systemd allows local users to cause a denial of service (system hang) via a zero-length message received over a notify socket, which causes an error to be returned and the notification handler to be disabled.

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0003.html
http://www.openwall.com/lists/oss-security/2016/09/30/1 Third Party Advisory
http://www.securityfocus.com/bid/93250 Third Party Advisory
http://www.securitytracker.com/id/1037320
https://bugzilla.redhat.com/show_bug.cgi?id=1381911 Issue TrackingThird Party AdvisoryVDB Entry
https://github.com/systemd/systemd/issues/4234#issuecomment-250441246 ExploitPatchVendor Advisory
https://rhn.redhat.com/errata/RHBA-2015-2092.html Third Party Advisory
https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet ExploitTechnical DescriptionThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0003.html
http://www.openwall.com/lists/oss-security/2016/09/30/1 Third Party Advisory
http://www.securityfocus.com/bid/93250 Third Party Advisory
http://www.securitytracker.com/id/1037320
https://bugzilla.redhat.com/show_bug.cgi?id=1381911 Issue TrackingThird Party AdvisoryVDB Entry
https://github.com/systemd/systemd/issues/4234#issuecomment-250441246 ExploitPatchVendor Advisory
https://rhn.redhat.com/errata/RHBA-2015-2092.html Third Party Advisory
https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet ExploitTechnical DescriptionThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-7796), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.