Description
systemd 250 and 251 allows local users to achieve a systemd-coredump deadlock by triggering a crash that has a long backtrace. This occurs in parse_elf_object in shared/elf-util.c. The exploitation methodology is to crash a binary calling the same function recursively, and put it in a deeply nested directory to make its backtrace large enough to cause the deadlock. This must be done 16 times when MaxConnections=16 is set for the systemd/units/systemd-coredump.socket file.
References (4)
Core 4
Core References
Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/076b807be472630692c5348c60d0c2b7b28ad437
Issue Tracking, Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/24853#issuecomment-1326561497
Issue Tracking, Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/25055#issuecomment-1313733553
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MS5N5SLYAHKENLAJWYBDKU55ICU3SVZF/
Scores
CVSS v3
5.5
EPSS
0.0004
EPSS Percentile
12.6%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-400
Status
published
Products (3)
fedoraproject/fedora
36
systemd_project/systemd
252 rc1 (2 CPE variants)
systemd_project/systemd
250 - 251
Published
Nov 23, 2022
Tracked Since
Feb 18, 2026