Description
receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.
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 | fastd | 21-1 | — |
| Debian 13 | fastd | 21-1 | — |
| Debian 12 | fastd | 21-1 | — |
| Debian 9 | fastd | 18-2+deb9u1 | DLA-2414-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | fastd | 18-3ubuntu0.1 | USN-4610-1 |
| Ubuntu 18.04 LTS | fastd | 18-3ubuntu0.18.04.1 | USN-4718-1 |
| Ubuntu 16.04 LTS | fastd | 17-4ubuntu0.1 | USN-4718-1 |
Advisories 3
- DLA-2414-1 fastd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-4718-1 fastd vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-4610-1 fastd vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
References
- https://fastd.readthedocs.io/en/stable/releases/v21.html
- https://github.com/NeoRaider/fastd/commit/737925113363b6130879729cdff9ccc46c33eaea
- https://bugs.debian.org/972521
- [debian-lts-announce] 20201025 [SECURITY] [DLA-2414-1] fastd security update mailing-list
- FEDORA-2020-495c14a23f vendor-advisory
- FEDORA-2020-01dc2bc62c vendor-advisory
- FEDORA-2020-13edfc3215 vendor-advisory