Descriptionkdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)buster1.17-3+deb10u4fixed
buster (security)1.17-3+deb10u6fixed
bullseye (security)1.18.3-6+deb11u3fixed
sid, trixie1.20.1-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
krb5source(unstable)(not affected)


- krb5 <not-affected> (Vulnerable code not present)
Introduced by: (krb5-1.21-beta1)
Fixed by:

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