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OpenAdvisories
High ALSA-2025:15786 3 CVEs

Important: kernel-rt security update

Published Sep 15, 2025 · Updated Oct 29, 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: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350)
* kernel: idpf: convert control queue mutex to a spinlock (CVE-2025-38392)
* kernel: drm/gem: Acquire references on GEM handles for framebuffers (CVE-2025-38449)

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 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.75.1.rt7.416.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.75.1.rt7.416.el8_10

Vulnerabilities 3

  • High 7.8
    CVE-2025-38350

    net/sched: Always pass notifications when child class becomes empty

    In the Linux kernel, the following vulnerability has been resolved: net/sched: Always pass notifications when child class becomes empty Certain classful qdiscs may invoke their classes' dequeue handler on an enqueue operation. This may unexpectedly empty the …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-38449

    drm/gem: Acquire references on GEM handles for framebuffers

    In the Linux kernel, the following vulnerability has been resolved: drm/gem: Acquire references on GEM handles for framebuffers A GEM handle can be released while the GEM buffer object is attached to a DRM framebuffer. This leads to the release of the dma-buf…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Unscored —
    CVE-2025-38392

    idpf: convert control queue mutex to a spinlock

    In the Linux kernel, the following vulnerability has been resolved: idpf: convert control queue mutex to a spinlock With VIRTCHNL2_CAP_MACFILTER enabled, the following warning is generated on module load: [ 324.701677] BUG: sleeping function called from inval…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-38350
  • report
    https://access.redhat.com/security/cve/CVE-2025-38392
  • report
    https://access.redhat.com/security/cve/CVE-2025-38449
  • report
    https://bugzilla.redhat.com/2382054
  • report
    https://bugzilla.redhat.com/2383407
  • report
    https://bugzilla.redhat.com/2383519
  • advisory
    https://errata.almalinux.org/8/ALSA-2025-15786.html