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7.5 High

CVE-2026-112320 Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching

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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Hardened Images Versions not published

Other CVEs of Red Hat Enterprise Linux 10

The 1475 CVEs of Red Hat Enterprise Linux 10 →
CVE-2026-122056 Openscap: one-byte heap buffer overflow in sds-compose may lead to denial-of-service 5.9 Medium CVE-2026-112314 Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries 7.5 High CVE-2026-112321 Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths 7.5 High CVE-2026-112319 Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation 6.5 Medium
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