🛡️ CVE-2025-6021 — enterprise-linux
Description
Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2
A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: None.
- Integrity impact: None.
- Availability impact: High — total loss, or loss the attacker controls.
Weakness class
CVE-2025-6021 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.
Affected software
CVE-2025-6021 is recorded against 23 packages.
- enterprise-linux
- enterprise-linux-eus
- enterprise-linux-for-arm-64
- enterprise-linux-for-arm-64-eus
- enterprise-linux-for-ibm-z-systems
- enterprise-linux-for-ibm-z-systems-eus
- enterprise-linux-for-power-little-endian
- enterprise-linux-for-power-little-endian-eus
- enterprise-linux-server
- enterprise-linux-server-aus
- enterprise-linux-server-for-power-little-endian-update-services-for-sap-solutions
- enterprise-linux-server-tus
- in-vehicle-operating-system
- java
- java-min
- jboss-core-services
- jre
- libxml2 (fixed in 2.14.4)
- openshift-container-platform
- openshift-container-platform-for-arm64
- openshift-container-platform-for-ibm-z
- openshift-container-platform-for-linuxone
- openshift-container-platform-for-power
Timeline and source
Published on 12 June 2025 and last revised on 30 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.
References
access.redhat.com
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access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
gitlab.gnome.org
lists.debian.org
cert-portal.siemens.com
gitlab.gnome.org
Other advisories for this package
enterprise-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:
- CVE-2026-59090 (8.4 High, published 10 Aug 2026)
- CVE-2026-59088 (5.5 Medium, published 10 Aug 2026)
- CVE-2026-59087 (7.8 High, published 10 Aug 2026)
- CVE-2026-59091 (7.3 High, published 10 Aug 2026)
- CVE-2026-71225 (6.5 Medium, published 5 Aug 2026)
- CVE-2026-71227 (5.1 Medium, published 5 Aug 2026)
- CVE-2026-71226 (7.3 High, published 5 Aug 2026)
- CVE-2026-68744 (3.3 Low, published 4 Aug 2026)
Same weakness in other software
These advisories are the same class of weakness (CWE-787: Out-of-bounds Write) in other software:
- CVE-2017-12605 (8.0 High, published 9 Jul 2026)
- CVE-2022-29208 (8.0 High, published 9 Jul 2026)
- CVE-2022-23561 (8.0 High, published 9 Jul 2026)
- CVE-2019-9423 (8.0 High, published 9 Jul 2026)
- CVE-2018-5268 (published 9 Jul 2026)
- CVE-2017-12606 (8.0 High, published 9 Jul 2026)
- CVE-2019-5063 (8.0 High, published 9 Jul 2026)
- CVE-2017-12603 (8.0 High, published 2 Jul 2026)
CVE-2025-6021 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| enterprise-linux | — | — |
| enterprise-linux-eus | — | — |
| enterprise-linux-for-arm-64 | — | — |
| enterprise-linux-for-arm-64-eus | — | — |
| enterprise-linux-for-ibm-z-systems | — | — |
| enterprise-linux-for-ibm-z-systems-eus | — | — |
| enterprise-linux-for-power-little-endian | — | — |
| enterprise-linux-for-power-little-endian-eus | — | — |
| enterprise-linux-server | — | — |
| enterprise-linux-server-aus | — | — |
| enterprise-linux-server-for-power-little-endian-update-services-for-sap-solutions | — | — |
| enterprise-linux-server-tus | — | — |
| in-vehicle-operating-system | — | — |
| java | — | — |
| java-min | — | — |
| jboss-core-services | — | — |
| jre | — | — |
| libxml2 | — | 2.14.4 |
| openshift-container-platform | — | — |
| openshift-container-platform-for-arm64 | — | — |
| openshift-container-platform-for-ibm-z | — | — |
| openshift-container-platform-for-linuxone | — | — |
| openshift-container-platform-for-power | — | — |
References
Similar Threats
- Medium CVE-2022-0851
- High CVE-2022-0358
- Medium CVE-2022-0480
- Medium CVE-2022-0485
- Medium CVE-2022-0852
Exploit Protection
Are you running enterprise-linux?
CVE-2025-6021 carries CVSS 8.0 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.
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