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Medium ALSA-2025:21920 3 CVEs

Moderate: kernel-rt security update

Published Nov 24, 2025 · Updated Nov 2, 2026

Ecosystem: AlmaLinux

Summary

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.

Fixed packages 10

ReleasePackageFixed in
AlmaLinux · 8 kernel-rt 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.85.1.rt7.426.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.85.1.rt7.426.el8_10

Vulnerabilities 3

  • High 8.8
    CVE-2025-39971

    i40e: fix idx validation in config queues msg

    In the Linux kernel, the following vulnerability has been resolved: i40e: fix idx validation in config queues msg Ensure idx is within range of active/initialized TCs when iterating over vf->ch[idx] in i40e_vc_config_queues_msg().

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 8.8
    CVE-2025-39973

    i40e: add validation for ring_len param

    In the Linux kernel, the following vulnerability has been resolved: i40e: add validation for ring_len param The `ring_len` parameter provided by the virtual function (VF) is assigned directly to the hardware memory context (HMC) without any validation. To add…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-39697

    NFS: Fix a race when updating an existing write

    In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a race when updating an existing write After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-39697
  • report
    https://access.redhat.com/security/cve/CVE-2025-39971
  • report
    https://bugzilla.redhat.com/2393481
  • report
    https://bugzilla.redhat.com/2404108
  • advisory
    https://errata.almalinux.org/8/ALSA-2025-21920.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2025-39973.html