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OpenAdvisories
Medium ALSA-2025:19440 3 CVEs

Moderate: kernel-rt security update

Published Nov 3, 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: wifi: mac80211: check S1G action frame size (CVE-2023-53257)
* kernel: wifi: mwifiex: Fix OOB and integer underflow when rx packets (CVE-2023-53226)
* kernel: wifi: cfg80211: fix use-after-free in cmp_bss() (CVE-2025-39864)

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 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.82.1.rt7.423.el8_10

Vulnerabilities 3

  • High 8.8
    CVE-2023-53226

    wifi: mwifiex: Fix OOB and integer underflow when rx packets

    In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: Fix OOB and integer underflow when rx packets Make sure mwifiex_process_mgmt_packet, mwifiex_process_sta_rx_packet and mwifiex_process_uap_rx_packet, mwifiex_uap_queue_bridged_…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.8
    CVE-2025-39864

    wifi: cfg80211: fix use-after-free in cmp_bss()

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix use-after-free in cmp_bss() Following bss_free() quirk introduced in commit 776b3580178f ("cfg80211: track hidden SSID networks properly"), adjust cfg80211_update_known_bs…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.1
    CVE-2023-53257

    wifi: mac80211: check S1G action frame size

    In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: check S1G action frame size Before checking the action code, check that it even exists in the frame.

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • report
    https://access.redhat.com/security/cve/CVE-2023-53226
  • report
    https://access.redhat.com/security/cve/CVE-2023-53257
  • report
    https://access.redhat.com/security/cve/CVE-2025-39864
  • report
    https://bugzilla.redhat.com/2395253
  • report
    https://bugzilla.redhat.com/2395420
  • report
    https://bugzilla.redhat.com/2396934
  • advisory
    https://errata.almalinux.org/8/ALSA-2025-19440.html