Description
resolv.c in the DNS resolver in uIP, and dns.c in the DNS resolver in lwIP 1.4.1 and earlier, does not use random values for ID fields and source ports of DNS query packets, which makes it easier for man-in-the-middle attackers to conduct cache-poisoning attacks via spoofed reply packets.
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | lwipv6 | No fix yet | — |
| Ubuntu 26.04 LTS | lwipv6 | No fix yet | — |
| Ubuntu 25.10 | lwipv6 | No fix yet | — |
| Ubuntu 24.04 LTS | lwipv6 | No fix yet | — |
| Ubuntu 22.04 LTS | lwipv6 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | lwipv6 | No fix yet | — |
| Ubuntu 18.04 LTS | lwipv6 | No fix yet | — |
| Ubuntu 16.04 LTS | lwipv6 | No fix yet | — |