Red Hat Security Advisory: krb5 security update
Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC). Security Fix(es): * krb5: overflow when calculating ulog block size (CVE-2025-24528) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.
AI Analysis
Technical Summary
CVE-2025-24528 is a vulnerability in the krb5 component of Red Hat Enterprise Linux involving an overflow during the calculation of the ulog block size. Kerberos is a network authentication system that uses a trusted third party (KDC) to authenticate clients and servers. The overflow could lead to unexpected behavior or security issues in the authentication process. Red Hat has issued security advisories RHSA-2025:1352 and RHSA-2025:2722 providing patches for affected versions of Red Hat Enterprise Linux 7 and 8, including Extended Lifecycle Support releases. The advisories also include a bug fix for kdb5_util related to DB entry flags. The vulnerability is rated as moderate severity by Red Hat Product Security. No active exploitation has been reported.
Potential Impact
The vulnerability could allow an overflow condition when calculating the ulog block size in krb5, potentially affecting the integrity or reliability of the Kerberos authentication process. Since Kerberos is critical for secure network authentication, this overflow could undermine authentication security if exploited. However, there are no known exploits in the wild currently, and the severity is rated moderate by the vendor.
Mitigation Recommendations
Red Hat has released official patches for this vulnerability in multiple Red Hat Enterprise Linux versions, including Extended Lifecycle Support releases for versions 7 and 8. Users should apply the updates provided in advisories RHSA-2025:1352 and RHSA-2025:2722 promptly to remediate the issue. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: krb5 security update
Description
Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC). Security Fix(es): * krb5: overflow when calculating ulog block size (CVE-2025-24528) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-24528 is a vulnerability in the krb5 component of Red Hat Enterprise Linux involving an overflow during the calculation of the ulog block size. Kerberos is a network authentication system that uses a trusted third party (KDC) to authenticate clients and servers. The overflow could lead to unexpected behavior or security issues in the authentication process. Red Hat has issued security advisories RHSA-2025:1352 and RHSA-2025:2722 providing patches for affected versions of Red Hat Enterprise Linux 7 and 8, including Extended Lifecycle Support releases. The advisories also include a bug fix for kdb5_util related to DB entry flags. The vulnerability is rated as moderate severity by Red Hat Product Security. No active exploitation has been reported.
Potential Impact
The vulnerability could allow an overflow condition when calculating the ulog block size in krb5, potentially affecting the integrity or reliability of the Kerberos authentication process. Since Kerberos is critical for secure network authentication, this overflow could undermine authentication security if exploited. However, there are no known exploits in the wild currently, and the severity is rated moderate by the vendor.
Mitigation Recommendations
Red Hat has released official patches for this vulnerability in multiple Red Hat Enterprise Linux versions, including Extended Lifecycle Support releases for versions 7 and 8. Users should apply the updates provided in advisories RHSA-2025:1352 and RHSA-2025:2722 promptly to remediate the issue. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:7067
- Cve Count
- 1
Threat ID: 6a3da1d44853345fc18266ea
Added to database: 06/25/2026, 21:47:00 UTC
Last enriched: 08/17/2026, 21:58:18 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 34
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