CVE-2026-112320

Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching

Published Nov 9, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by repeatedly establishing and abandoning GSS authentication contexts.

Remediation

Vendor Workaround

Restrict network access to kadmind to trusted hosts, or disable it in favor of kadmin.local server-side command line tool for administration operations if possible.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Redhat rhel Eus
CPEs cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:rhel_eus:9.8::appstream
cpe:/o:redhat:enterprise_linux:9::baseos
cpe:/o:redhat:rhel_eus:9.8::baseos
Vendors & Products Redhat rhel Eus
References
Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
CPEs cpe:/o:redhat:enterprise_linux_eus:10.2
Vendors & Products Redhat enterprise Linux Eus
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:10.3
References
Type Values Removed Values Added
First Time appeared Red Hat
Red Hat enterprise Linux
Redhat hardened Images
Vendors & Products Red Hat
Red Hat enterprise Linux
Redhat hardened Images
Type Values Removed Values Added
Description The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by repeatedly establishing and abandoning GSS authentication contexts.
Title Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
Weaknesses CWE-772
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 12, 2026, 11:01 PM
Reserved
Oct 19, 2026, 2:26 PM
Status
Awaiting Analysis
Published
Nov 9, 2026, 7:16 PM
Modified
Nov 13, 2026, 12:20 AM
Severity
Important
Public date
Nov 9, 2026, 3:00 PM