CVE-2025-24528

krb5: overflow when calculating ulog block size

Published Jan 16, 2026 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Description
In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() in kdb_log.c. An authenticated attacker can cause an out-of-bounds write and kadmind daemon crash.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4065-1 krb5 security update
Ubuntu USN Ubuntu USN USN-7314-1 Kerberos vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A flaw was found in krb5. With incremental propagation enabled, an authenticated attacker can cause kadmind to write beyond the end of the mapped region for the iprop log file. This issue can trigger a process crash and lead to a denial of service. In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() in kdb_log.c. An authenticated attacker can cause an out-of-bounds write and kadmind daemon crash.
First Time appeared Mit
Mit kerberos 5
Weaknesses CWE-190
CPEs cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
Vendors & Products Mit
Mit kerberos 5
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H'}

Type Values Removed Values Added
First Time appeared Redhat discovery
CPEs cpe:/a:redhat:discovery:1.14::el9
Vendors & Products Redhat discovery
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Type Values Removed Values Added
First Time appeared Redhat enterprise Linux
Redhat openshift Distributed Tracing
CPEs cpe:/a:redhat:openshift_distributed_tracing:3.5::el8
cpe:/o:redhat:enterprise_linux:8
Vendors & Products Redhat enterprise Linux
Redhat openshift Distributed Tracing
Type Values Removed Values Added
First Time appeared Redhat
Redhat rhel Els
CPEs cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat rhel Els
Type Values Removed Values Added
Description A flaw was found in krb5. With incremental propagation enabled, an authenticated attacker can cause kadmind to write beyond the end of the mapped region for the iprop log file. This issue can trigger a process crash and lead to a denial of service.
Title krb5: overflow when calculating ulog block size
Weaknesses CWE-787
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jan 16, 2026, 6:06 PM
Reserved
Jan 23, 2025, 12:00 AM
Status
Deferred
Published
Jan 16, 2026, 6:16 PM
Modified
Jun 17, 2026, 8:59 AM
Severity
Moderate
Public date
Jan 28, 2024, 12:00 AM