Skip to content
OpenAdvisories
Medium ALSA-2025:16920 4 CVEs

Moderate: kernel-rt security update

Published Sep 29, 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: nfsd: don't ignore the return code of svc_proc_register() (CVE-2025-22026)
* kernel: net_sched: hfsc: Fix a UAF vulnerability in class handling (CVE-2025-37797)
* kernel: firmware: arm_scpi: Ensure scpi_info is not assigned if the probe fails (CVE-2022-50087)
* kernel: sctp: linearize cloned gso packets in sctp_rcv (CVE-2025-38718)

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 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.77.1.rt7.418.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.77.1.rt7.418.el8_10

Vulnerabilities 4

  • High 7.8
    CVE-2022-50087

    firmware: arm_scpi: Ensure scpi_info is not assigned if the probe fails

    In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scpi: Ensure scpi_info is not assigned if the probe fails When scpi probe fails, at any point, we need to ensure that the scpi_info is not set and will remain NULL until the pro…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-37797

    net_sched: hfsc: Fix a UAF vulnerability in class handling

    In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-us…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-38718

    sctp: linearize cloned gso packets in sctp_rcv

    In the Linux kernel, the following vulnerability has been resolved: sctp: linearize cloned gso packets in sctp_rcv A cloned head skb still shares these frag skbs in fraglist with the original head skb. It's not safe to access these frag skbs. syzbot reported …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Unscored —
    CVE-2025-22026

    nfsd: don't ignore the return code of svc_proc_register()

    In the Linux kernel, the following vulnerability has been resolved: nfsd: don't ignore the return code of svc_proc_register() Currently, nfsd_proc_stat_init() ignores the return value of svc_proc_register(). If the procfile creation fails, then the kernel wil…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2022-50087
  • report
    https://access.redhat.com/security/cve/CVE-2025-22026
  • report
    https://access.redhat.com/security/cve/CVE-2025-37797
  • report
    https://access.redhat.com/security/cve/CVE-2025-38718
  • report
    https://bugzilla.redhat.com/2360224
  • report
    https://bugzilla.redhat.com/2363672
  • report
    https://bugzilla.redhat.com/2373539
  • report
    https://bugzilla.redhat.com/2393166
  • advisory
    https://errata.almalinux.org/8/ALSA-2025-16920.html