Descriptionnet/core/net_namespace.c in the Linux kernel 2.6.32 and earlier does not properly handle a high rate of creation and cleanup of network namespaces, which makes it easier for remote attackers to cause a denial of service (memory consumption) via requests to a daemon that requires a separate namespace per connection, as demonstrated by vsftpd.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs629373

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
vsftpd (PTS)buster, bullseye3.0.3-12fixed
bookworm, sid3.0.3-13fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[lenny] - linux-2.6 <no-dsa> (attacker needs elevated CAP_SYS_ADMIN privileges to abuse this)
[squeeze] - linux-2.6 <no-dsa> (attacker needs elevated CAP_SYS_ADMIN privileges to abuse this)
this is technically a kernel bug. however this has been workarounded specifically
for vsftpd by adding a kernel check before using this feature, see DSA-2304-1
for details

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