Description
The process_tgs_req function in do_tgs_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.2 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted TGS request that triggers an error other than the KRB5_KDB_NOENTRY error.
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 | krb5 | 1.10+dfsg~alpha1-7 | — |
| Debian 13 | krb5 | 1.10+dfsg~alpha1-7 | — |
| Debian 12 | krb5 | 1.10+dfsg~alpha1-7 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.9-22.el6_2.1 | RHSA-2011:1790 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 2
- RHSA-2011:1790 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 47124 third-party-advisory
- kerberos-processtgsreq-dos(71655) vdb-entry
- 50929 vdb-entry
- RHSA-2011:1790 vendor-advisory
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-007.txt
- MDVSA-2011:184 vendor-advisory
- 1026374 vdb-entry
- 20111206 MITKRB5-SA-2011-007 KDC null pointer dereference in TGS handling [CVE-2011-1530] mailing-list