systemd: freeze when PID 1 receives a zero-length message over notify socket
Published Oct 13, 2016
6.8
MEDIUMCVSS 3.0
EPSS 0.85%
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.
Affected products
No data.
Configuration 1
- 209
- 213
- 214
- 229
Configuration 2
- 12.0
- 12
- 12.0
- 12.0
- 12.0
Configuration 3
- 7.0
- 7.0
- 7.0
- 7.0
No data.
Red Hat Enterprise Linux 7
systemd-0:219-19.el7
Fixed · RHBA-2015:2092
Red Hat Enterprise Linux 7.1 Extended Update Support
systemd-0:208-20.ael7b_1.9
Fixed · RHSA-2017:0003
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | systemd-0:219-19.el7 | Fixed | RHBA-2015:2092 |
| Red Hat Enterprise Linux 7.1 Extended Update Support | systemd-0:208-20.ael7b_1.9 | Fixed | RHSA-2017:0003 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
AV:L/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.85% (0.00855) | 56.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.85% (0.00855) | 53.41th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.34% (0.00338) | 54.38th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00051) | 22.03th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.05% (0.00051) | 20.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00051) | 18.08th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 22, 2023 | 1.28% (0.01282) | 68.05th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (13)
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0003.html vendor-advisoryx_refsource_REDHAT
- http://www.openwall.com/lists/oss-security/2016/09/30/1 mailing-listx_refsource_MLISTThird Party Advisory
- http://www.securityfocus.com/bid/93250 vdb-entryx_refsource_BIDThird Party Advisory
- http://www.securitytracker.com/id/1037320 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-7796 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1381911 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://github.com/systemd/systemd/issues/4234#issuecomment-250441246 x_refsource_CONFIRMExploitPatchVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-7796
- https://rhn.redhat.com/errata/RHBA-2015-2092.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet x_refsource_MISCExploitTechnical DescriptionThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-7796
Change history (0)
No recorded changes yet.