RHBA-2025:23314 - Bug Fix Advisory

Topic

An update for passt is now available for Red Hat Enterprise Linux 9.

Description

passt implements a translation layer between a Layer-2 network interface and native Layer-4 sockets (TCP, UDP, ICMP/ICMPv6 echo) on a host. It doesn't require any capabilities or privileges, and it can be used as a simple replacement for Slirp. pasta (same binary as passt, different command) offers equivalent functionality, for network namespaces: traffic is forwarded using a tap interface inside the namespace, without the need to create further interfaces on the host, hence not requiring any capabilities or privileges.

Bug Fix(es) and Enhancement(s):

• passt/pasta can crash on certain sequences of out of order TCP packets [rhel-9.7.z] (JIRA:RHEL-123413)
• passt might truncate data transfers if socket buffer fills up right as we receive FIN from container/guest [rhel-9.7.z] (JIRA:RHEL-123419)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

CVEs

(none)

References

(none)