Debian Systemd vulnerabilities

CVE-2022-2526 [CRITICAL] CVE-2022-2526: systemd - A use-after-free vulnerability was found in systemd. This issue occurs due to th... A use-after-free vulnerability was found in systemd. This issue occurs due to the on_stream_io() function and dns_stream_complete() function in 'resolved-dns-stream.c' not incrementing the reference counting for the DnsStream object. Therefore, other functions and callbacks called can dereference the DNSStream object, causing the use-after-free when the reference

CVE-2020-1712 [HIGH] CVE-2020-1712: systemd - A heap use-after-free vulnerability was found in systemd before version v245-rc1... A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages. Scope: local bookworm: resolved

CVE-2018-6954 [HIGH] CVE-2018-6954: systemd - systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-termi... systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on. Scope: l

CVE-2026-4105 [MEDIUM] CVE-2026-4105: systemd - A flaw was found in systemd. The systemd-machined service contains an Improper A... A flaw was found in systemd. The systemd-machined service contains an Improper Access Control vulnerability due to insufficient validation of the class parameter in the RegisterMachine D-Bus (Desktop Bus) method. A local unprivileged user can exploit this by attempting to register a machine with a specific class value, which may leave behind a usable, attacker-contr

CVE-2018-1049 [MEDIUM] CVE-2018-1049: systemd - In systemd prior to 234 a race condition exists between .mount and .automount un... In systemd prior to 234 a race condition exists between .mount and .automount units such that automount requests from kernel may not be serviced by systemd resulting in kernel holding the mountpoint and any processes that try to use said mount will hang. A race condition like this may lead to denial of service, until mount points are unmounted. Scope: local bookworm

CVE-2021-33910 [MEDIUM] CVE-2021-33910: systemd - basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memo... basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash. Scope: local bookworm: resolved (fixed in 247.3-6) bullseye: resolved (fixed in 247.3-6) forky: resolved (fixed in 247.3-6)

CVE-2020-13776 [CRITICAL] CVE-2020-13776: systemd - systemd through v245 mishandles numerical usernames such as ones composed of dec... systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits, as demonstrated by use of root privileges when privileges of the 0x0 user account were intended. NOTE: this issue exists because of an incomplete fix for CVE-2017-1000082. Scope: local bookworm: resolved (fixed in 246-2) bullseye: resolved (f

CVE-2023-7008 [MEDIUM] CVE-2023-7008: systemd - A vulnerability was found in systemd-resolved. This issue may allow systemd-reso... A vulnerability was found in systemd-resolved. This issue may allow systemd-resolved to accept records of DNSSEC-signed domains even when they have no signature, allowing man-in-the-middles (or the upstream DNS resolver) to manipulate records. Scope: local bookworm: resolved (fixed in 252.21-1~deb12u1) bullseye: resolved (fixed in 247.3-7+deb11u6) forky: resolved (f

CVE-2020-13529 [MEDIUM] CVE-2020-13529: systemd - An exploitable denial-of-service vulnerability exists in Systemd 245. A speciall... An exploitable denial-of-service vulnerability exists in Systemd 245. A specially crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack. An attacker can forge a pair of FORCERENEW and DCHP ACK packets to reconfigure the server. Scope: local bookworm: resolved (fixed in 249.4-2) bullseye: open forky

CVE-2026-29111 [MEDIUM] CVE-2026-29111: systemd - systemd, a system and service manager, (as PID 1) hits an assert and freezes exe... systemd, a system and service manager, (as PID 1) hits an assert and freezes execution when an unprivileged IPC API call is made with spurious data. On version v249 and older the effect is not an assert, but stack overwriting, with the attacker controlled content. From version v250 and newer this is not possible as the safety check causes an assert instead. This I

CVE-2025-4598 [MEDIUM] CVE-2025-4598: systemd - A vulnerability was found in systemd-coredump. This flaw allows an attacker to f... A vulnerability was found in systemd-coredump. This flaw allows an attacker to force a SUID process to crash and replace it with a non-SUID binary to access the original's privileged process coredump, allowing the attacker to read sensitive data, such as /etc/shadow content, loaded by the original process. A SUID binary or process has a special type of permission, w

CVE-2019-6454 [MEDIUM] CVE-2019-6454: systemd - An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsys... An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsystemd/sd-bus/bus-objects.c allocates a variable-length stack buffer for temporarily storing the object path of incoming D-Bus messages. An unprivileged local user can exploit this by sending a specially crafted message to PID1, causing the stack pointer to jump over the stack guard pages

CVE-2022-4415 [MEDIUM] CVE-2022-4415: systemd - A vulnerability was found in systemd. This security flaw can cause a local infor... A vulnerability was found in systemd. This security flaw can cause a local information leak due to systemd-coredump not respecting the fs.suid_dumpable kernel setting. Scope: local bookworm: resolved (fixed in 252.4-1) bullseye: resolved (fixed in 247.3-7+deb11u2) forky: resolved (fixed in 252.4-1) sid: resolved (fixed in 252.4-1) trixie: resolved (fixed in 252.4-1)

CVE-2021-3997 [MEDIUM] CVE-2021-3997: systemd - A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may l... A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp. Scope: local bookworm: resolved (fixed in 250.2-1) bullseye: resolved (fixed in 247.3-7) forky: resolved (fixed in 250.2-1) sid: resolved (fixed in 250.2-1) trixie: resolved (fixed in 250.2-1)

CVE-2012-0871 [MEDIUM] CVE-2012-0871: systemd - The session_link_x11_socket function in login/logind-session.c in systemd-logind... The session_link_x11_socket function in login/logind-session.c in systemd-logind in systemd, possibly 37 and earlier, allows local users to create or overwrite arbitrary files via a symlink attack on the X11 user directory in /run/user/. Scope: local bookworm: resolved (fixed in 43-1) bullseye: resolved (fixed in 43-1) forky: resolved (fixed in 43-1) sid: resolved (

CVE-2013-4327 [HIGH] CVE-2013-4327: systemd - systemd does not properly use D-Bus for communication with a polkit authority, w... systemd does not properly use D-Bus for communication with a polkit authority, which allows local users to bypass intended access restrictions by leveraging a PolkitUnixProcess PolkitSubject race condition via a (1) setuid process or (2) pkexec process, a related issue to CVE-2013-4288. Scope: local bookworm: resolved (fixed in 204-5) bullseye: resolved (fixed in 204-

CVE-2013-4394 [MEDIUM] CVE-2013-4394: systemd - The SetX11Keyboard function in systemd, when PolicyKit Local Authority (PKLA) is... The SetX11Keyboard function in systemd, when PolicyKit Local Authority (PKLA) is used to change the group permissions on the X Keyboard Extension (XKB) layouts description, allows local users in the group to modify the Xorg X11 Server configuration file and possibly gain privileges via vectors involving "special and control characters." Scope: local bookworm: resolv

CVE-2022-3821 [MEDIUM] CVE-2022-3821: systemd - An off-by-one Error issue was discovered in Systemd in format_timespan() functio... An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c. An attacker could supply specific values for time and accuracy that leads to buffer overrun in format_timespan(), leading to a Denial of Service. Scope: local bookworm: resolved (fixed in 251.3-1) bullseye: resolved (fixed in 247.3-7+deb11u2) forky: resolved (fixed in 2

CVE-2012-1101 [MEDIUM] CVE-2012-1101: systemd - systemd 37-1 does not properly handle non-existent services, which causes a deni... systemd 37-1 does not properly handle non-existent services, which causes a denial of service (failure of login procedure). Scope: local bookworm: resolved (fixed in 43-1) bullseye: resolved (fixed in 43-1) forky: resolved (fixed in 43-1) sid: resolved (fixed in 43-1) trixie: resolved (fixed in 43-1)

CVE-2022-45873 [MEDIUM] CVE-2022-45873: systemd - systemd 250 and 251 allows local users to achieve a systemd-coredump deadlock by... 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