systemd: reexec state injection: fgets() on overlong lines leads to line splitting
Published Oct 26, 2018
7.8
HIGHCVSS 3.1
EPSS 2.26%
Description
A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly lead to root privilege escalation. Affected releases are systemd versions up to and including 239.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<=239
- Version
Configuration 1
- 16.04
- 18.04
- 18.10
- 8.0
Configuration 2
- ≤ 239
Configuration 3
- 1.4.0
No data.
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-34/ansible-tower-memcached:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-35/ansible-tower-memcached:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Enterprise Linux 7
systemd-0:219-67.el7
Fixed · RHSA-2019:2091
Red Hat Enterprise Linux 7.4 Advanced Update Support
systemd-0:219-42.el7_4.20
Fixed · RHSA-2020:0593
Red Hat Enterprise Linux 7.4 Telco Extended Update Support
systemd-0:219-42.el7_4.20
Fixed · RHSA-2020:0593
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
systemd-0:219-42.el7_4.20
Fixed · RHSA-2020:0593
Red Hat Enterprise Linux 7.5 Extended Update Support
systemd-0:219-57.el7_5.9
Fixed · RHSA-2020:1264
Red Hat Enterprise Linux 7.6 Extended Update Support
systemd-0:219-62.el7_6.11
Fixed · RHSA-2019:3222
Red Hat Enterprise Linux 8
systemd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-34/ansible-tower-memcached:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-35/ansible-tower-memcached:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Enterprise Linux 7 | systemd-0:219-67.el7 | Fixed | RHSA-2019:2091 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | systemd-0:219-42.el7_4.20 | Fixed | RHSA-2020:0593 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | systemd-0:219-42.el7_4.20 | Fixed | RHSA-2020:0593 |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | systemd-0:219-42.el7_4.20 | Fixed | RHSA-2020:0593 |
| Red Hat Enterprise Linux 7.5 Extended Update Support | systemd-0:219-57.el7_5.9 | Fixed | RHSA-2020:1264 |
| Red Hat Enterprise Linux 7.6 Extended Update Support | systemd-0:219-62.el7_6.11 | Fixed | RHSA-2019:3222 |
| Red Hat Enterprise Linux 8 | systemd | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jun 9, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.26% (0.02261) | 82.36th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.28% (0.02279) | 80.80th | v5 (v2026.06.15) |
| Nov 10, 2025 | 0.88% (0.00876) | 74.53th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.03% (0.02028) | 82.59th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.33% (0.00330) | 71.90th | v3 (v2023.03.01) |
| Oct 20, 2023 | 0.24% (0.00240) | 61.76th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.17% (0.00173) | 52.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.46% (0.05463) | 89.95th | v2 (v2022.01.01) |
| Jan 2, 2023 | 5.46% (0.05463) | 89.51th | v2 (v2022.01.01) |
| Oct 12, 2022 | 6.26% (0.06261) | 90.43th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.15% (0.07152) | 91.52th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.15% (0.07152) | 80.03th | v2 (v2022.01.01) |
| Feb 3, 2022 | 16.72% (0.16717) | 90.29th | v1 |
| Jan 6, 2022 | 16.72% (0.16717) | 90.17th | v1 |
| Sep 1, 2021 | 16.72% (0.16717) | 97.37th | v1 |
| Jul 21, 2021 | 16.72% (0.16717) | 0.00th | v1 |
| Apr 14, 2021 | 15.53% (0.15532) | 0.00th | v1 |
References (15)
- http://www.securityfocus.com/bid/105747 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:2091 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3222 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0593 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-15686 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1639071 Issue Tracking
- https://github.com/systemd/systemd/pull/10519 x_refsource_MISCPatchThird Party Advisory
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.debian.org/debian-lts-announce/2018/11/msg00017.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-15686
- https://security.gentoo.org/glsa/201810-10 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3816-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-15686
- https://www.exploit-db.com/exploits/45714/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISCThird Party Advisory
Change history (0)
No recorded changes yet.