Description
In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | systemd | 233-10 | — |
| Debian 13 | systemd | 233-10 | — |
| Debian 12 | systemd | 233-10 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | systemd | 229-4ubuntu19 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | systemd | 228-150.9.3 | SUSE-SU-2017:2031-1 |
| SLES 12 SP2 | dracut | 044.1-109.8.3 | SUSE-SU-2017:1898-1 |
| SLES 12 SP2 | systemd | 228-150.7.1 | SUSE-SU-2017:1898-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | systemd | 228-150.9.3 | SUSE-SU-2017:2031-1 |
| SLES for SAP 12 SP2 | dracut | 044.1-109.8.3 | SUSE-SU-2017:1898-1 |
| SLES for SAP 12 SP2 | systemd | 228-150.7.1 | SUSE-SU-2017:1898-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | systemd | 249.4-2.2 | openSUSE-SU-2024:11420-1 |
Advisories 3
- SUSE-SU-2017:2031-1 Security update for systemd SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11420-1 libsystemd0-249.4-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1898-1 Security update for systemd, dracut SUSE / openSUSE Security Updates · May 2, 2025