Red Hat Security Advisory: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: vsock: Keep the binding until socket destruction (CVE-2025-21756) 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.
AI Analysis
Technical Summary
CVE-2025-21756 is a vulnerability in the Linux kernel's vsock component where the binding is not kept until socket destruction, potentially leading to use-after-free conditions (CWE-416). Red Hat has issued a security advisory (RHSA-2025:8058) providing an update for Red Hat Enterprise Linux 9.4 Extended Update Support to fix this issue. The advisory instructs users to apply the kernel update and reboot the system to ensure the fix is applied. The vulnerability is rated as Important by Red Hat and high severity by the source, but no CVSS score is provided. No exploits are currently known in the wild.
Potential Impact
The vulnerability affects the Linux kernel's vsock subsystem, which could lead to use-after-free conditions. This may allow an attacker to cause system instability or potentially execute arbitrary code, depending on exploitation. However, no known exploits have been reported in the wild. The impact is rated as Important by Red Hat, indicating a significant security concern that warrants prompt patching.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 9.4 Extended Update Support that addresses CVE-2025-21756. Users should apply the kernel update as described in Red Hat advisory RHSA-2025:8058 and reboot affected systems to activate the fix. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: kernel security update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: vsock: Keep the binding until socket destruction (CVE-2025-21756) 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.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-21756 is a vulnerability in the Linux kernel's vsock component where the binding is not kept until socket destruction, potentially leading to use-after-free conditions (CWE-416). Red Hat has issued a security advisory (RHSA-2025:8058) providing an update for Red Hat Enterprise Linux 9.4 Extended Update Support to fix this issue. The advisory instructs users to apply the kernel update and reboot the system to ensure the fix is applied. The vulnerability is rated as Important by Red Hat and high severity by the source, but no CVSS score is provided. No exploits are currently known in the wild.
Potential Impact
The vulnerability affects the Linux kernel's vsock subsystem, which could lead to use-after-free conditions. This may allow an attacker to cause system instability or potentially execute arbitrary code, depending on exploitation. However, no known exploits have been reported in the wild. The impact is rated as Important by Red Hat, indicating a significant security concern that warrants prompt patching.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 9.4 Extended Update Support that addresses CVE-2025-21756. Users should apply the kernel update as described in Red Hat advisory RHSA-2025:8058 and reboot affected systems to activate the fix. 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-2025:8058
- Cve Count
- 1
Threat ID: 6a3da1d04853345fc1824c14
Added to database: 06/25/2026, 21:46:56 UTC
Last enriched: 06/25/2026, 22:09:12 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 9
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