Red Hat Security Advisory: kernel-rt security update
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: NFS: Fix a race when updating an existing write (CVE-2025-39697) * kernel: i40e: fix idx validation in config queues msg (CVE-2025-39971) 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
The Red Hat kernel-rt security update fixes multiple vulnerabilities affecting the Real Time Linux Kernel in Red Hat Enterprise Linux 8. Specifically, it addresses a race condition in the NFS subsystem (CVE-2025-39697) and an index validation flaw in the i40e network driver (CVE-2025-39971). These issues could potentially lead to inconsistent kernel behavior or memory corruption. The advisory references three CVEs in total, including CVE-2025-39973, though details on the latter are not provided. The update is classified as having moderate impact and is distributed via official Red Hat errata RHSA-2025:21920. Systems must be rebooted after applying the update for changes to take effect.
Potential Impact
The vulnerabilities fixed include a race condition in NFS write updates and an index validation flaw in the i40e network driver. These could cause kernel instability or memory corruption, potentially impacting system reliability and security. The overall security impact is rated moderate by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official security update is available from Red Hat as part of errata RHSA-2025:21920. Users should apply the kernel-rt update for Red Hat Enterprise Linux 8 Real Time as soon as possible and reboot the system to activate the fixes. Refer to https://access.redhat.com/articles/11258 for detailed update instructions. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: kernel-rt security update
Description
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: NFS: Fix a race when updating an existing write (CVE-2025-39697) * kernel: i40e: fix idx validation in config queues msg (CVE-2025-39971) 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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat kernel-rt security update fixes multiple vulnerabilities affecting the Real Time Linux Kernel in Red Hat Enterprise Linux 8. Specifically, it addresses a race condition in the NFS subsystem (CVE-2025-39697) and an index validation flaw in the i40e network driver (CVE-2025-39971). These issues could potentially lead to inconsistent kernel behavior or memory corruption. The advisory references three CVEs in total, including CVE-2025-39973, though details on the latter are not provided. The update is classified as having moderate impact and is distributed via official Red Hat errata RHSA-2025:21920. Systems must be rebooted after applying the update for changes to take effect.
Potential Impact
The vulnerabilities fixed include a race condition in NFS write updates and an index validation flaw in the i40e network driver. These could cause kernel instability or memory corruption, potentially impacting system reliability and security. The overall security impact is rated moderate by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official security update is available from Red Hat as part of errata RHSA-2025:21920. Users should apply the kernel-rt update for Red Hat Enterprise Linux 8 Real Time as soon as possible and reboot the system to activate the fixes. Refer to https://access.redhat.com/articles/11258 for detailed update instructions. 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-2025:21920
- Cve Count
- 3
- Additional Cves
- ["CVE-2025-39971","CVE-2025-39973"]
- Cvss Version
- null
Threat ID: 6a3da1db4853345fc18291b9
Added to database: 06/25/2026, 21:47:07 UTC
Last enriched: 06/25/2026, 22:21:05 UTC
Last updated: 07/02/2026, 20:51:16 UTC
Views: 14
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