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Fencer Vulns
high 7.1

CVE-2025-24528 json

In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() i…

published 2026-01-16 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-2883

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

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.

Patch / fix

  • MIT Kerberos 5 1.22
  • krb5 Debian 12 1.20.1-2+deb12u3
  • krb5 Debian 14, Debian 13 1.21.3-5

debian advisories DEBIAN-CVE-2025-24528

  • krb5 Ubuntu 20.04 LTS 1.17-6ubuntu4.9
  • krb5 Ubuntu 22.04 LTS 1.19.2-2ubuntu0.6
  • krb5 Ubuntu 24.04 LTS 1.20.1-6ubuntu2.5
  • krb5 Ubuntu 25.10 1.21.3-4ubuntu2

ubuntu advisories UBUNTU-CVE-2025-24528

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • krb5 RHEL 9 1.21.1-6.el9
  • libkadm5 RHEL 9 1.21.1-6.el9
  • krb5-libs RHEL 9 1.21.1-6.el9
  • krb5-pkinit RHEL 9 1.21.1-6.el9
  • krb5-server RHEL 9 1.21.1-6.el9
  • krb5-server-ldap RHEL 9 1.21.1-6.el9
  • krb5-workstation RHEL 9 1.21.1-6.el9
  • krb5 RHEL 8 1.18.2-31.el8_10

red hat advisories RHSA-2025:7067RHSA-2025:2722RHSA-2025:1352

  • krb5 Linux Micro 6.1 1.21.3-slfo.1.1_2.1
  • krb5 Linux Micro 6.0 1.20.1-6.1
  • krb5 SLE Micro 5.2, SLE Micro 5.1 1.19.2-150300.22.1
  • krb5 SLE Module for Server Applications 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 1.20.1-150600.11.8.1
  • crypto-policies SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 20230920.570ea89-150600.3.3.1
  • krb5 SLE Micro 5.4, SLE Micro 5.3 1.19.2-150400.3.15.1
  • krb5 SLE Micro 5.5 1.20.1-150500.3.12.1
  • krb5 SLES LTSS Extended Security 12 SP5 1.16.3-46.18.1

suse advisories SUSE-SU-2025:20303-1SUSE-SU-2025:20153-1SUSE-SU-2025:0822-1SUSE-SU-2025:0401-1SUSE-SU-2025:0351-1SUSE-SU-2025:0343-1

  • krb5 openSUSE Tumbleweed 1.21.3-2.1

opensuse advisories openSUSE-SU-2025:14736-1

  • libkadm5 AlmaLinux 9 1.21.1-6.el9
  • krb5-libs AlmaLinux 9 1.21.1-6.el9
  • krb5-pkinit AlmaLinux 9 1.21.1-6.el9
  • krb5-server AlmaLinux 9 1.21.1-6.el9
  • krb5-server-ldap AlmaLinux 9 1.21.1-6.el9
  • krb5-workstation AlmaLinux 9 1.21.1-6.el9
  • libkadm5 AlmaLinux 8 1.18.2-31.el8_10
  • krb5-libs AlmaLinux 8 1.18.2-31.el8_10

almalinux advisories ALSA-2025:7067ALSA-2025:2722

  • krb5 Rocky Linux 9 1.21.1-6.el9
  • krb5 Rocky Linux 8 1.18.2-31.el8_10

rocky linux advisories RLSA-2025:7067RLSA-2025:2722

  • krb5 Azure Linux 3.0 1.21.3-3
  • krb5 CBL-Mariner 2.0 1.19.4-5

azure linux advisories AZL-74852AZL-74862

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-24528 updated cvss 6.5

krb5: overflow when calculating ulog block size

  • Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”
  • Red Hat Discovery 1.14 discovery 1.14.2-1748467619, discovery 1.14.3-1748529279
    fixed: vendor fix RHSA-2025:8385
  • Red Hat Enterprise Linux AppStream (v. 9) krb5-devel 1.21.1-6.el9, krb5-debuginfo 1.21.1-6.el9, krb5-debugsource 1.21.1-6.el9, libkadm5-debuginfo 1.21.1-6.el9, krb5-libs-debuginfo 1.21.1-6.el9, krb5-pkinit-debuginfo 1.21.1-6.el9, +3 more
    fixed: vendor fix RHSA-2025:7067
  • Red Hat Enterprise Linux BaseOS (v. 8) krb5 1.18.2-31.el8_10, libkadm5 1.18.2-31.el8_10, krb5-libs 1.18.2-31.el8_10, krb5-pkinit 1.18.2-31.el8_10, krb5-server 1.18.2-31.el8_10, krb5-server-ldap 1.18.2-31.el8_10, +1 more
    fixed: vendor fix RHSA-2025:2722
  • Red Hat Enterprise Linux BaseOS (v. 9) krb5 1.21.1-6.el9, libkadm5 1.21.1-6.el9, krb5-libs 1.21.1-6.el9, krb5-pkinit 1.21.1-6.el9, krb5-server 1.21.1-6.el9, krb5-server-ldap 1.21.1-6.el9, +1 more
    fixed: vendor fix RHSA-2025:7067
  • Red Hat Enterprise Linux Server (v. 7 ELS) krb5 1.15.1-55.el7_9.4, libkadm5 1.15.1-55.el7_9.4, krb5-libs 1.15.1-55.el7_9.4, krb5-pkinit 1.15.1-55.el7_9.4, krb5-server 1.15.1-55.el7_9.4, krb5-server-ldap 1.15.1-55.el7_9.4, +1 more
    fixed: vendor fix RHSA-2025:1352
  • Red Hat OpenShift distributed tracing 3.5.3 rhosdt
    fixed: vendor fix RHSA-2025:2789
show 1 more
  • Red Hat Ansible Automation Platform 2 aap-cloud-metrics-collector-container, ansible-automation-platform-25/ee-minimal-rhel8, ansible-automation-platform-24/ee-supported-rhel9, ansible-automation-platform-25/ansible-builder-rhel8 Red Hat Enterprise Linux 10 krb5 Red Hat OpenShift distributed tracing 3.5.3 rhosdt
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H

Affected products

  • MIT Kerberos 5

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.