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High ALSA-2026:1148 4 CVEs

Important: kernel-rt security update

Published Jan 26, 2026 · 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: Bluetooth: hci_event: call disconnect callback before deleting conn (CVE-2023-53673)
* kernel: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping (CVE-2025-40154)
* kernel: Linux kernel: vsock vulnerability may lead to memory corruption (CVE-2025-40248)
* kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE (CVE-2025-40277)

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 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.97.1.rt7.438.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.97.1.rt7.438.el8_10

Vulnerabilities 4

  • High 8.8
    CVE-2023-53673

    Bluetooth: hci_event: call disconnect callback before deleting conn

    In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: call disconnect callback before deleting conn In hci_cs_disconnect, we do hci_conn_del even if disconnection failed. ISO, L2CAP and SCO connections refer to the hci_conn…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-40248

    vsock: Ignore signal/timeout on connect() if already established

    In the Linux kernel, the following vulnerability has been resolved: vsock: Ignore signal/timeout on connect() if already established During connect(), acting on a signal/timeout by disconnecting an already established socket leads to several issues: 1. connec…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-40277

    drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE

    In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE This data originates from userspace and is used in buffer offset calculations which could potentially overflow causing a…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Unscored —
    CVE-2025-40154

    ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping

    In the Linux kernel, the following vulnerability has been resolved: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping When an invalid value is passed via quirk option, currently bytcr_rt5640 driver only shows an error message but leaves as is. This m…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • report
    https://access.redhat.com/security/cve/CVE-2023-53673
  • report
    https://access.redhat.com/security/cve/CVE-2025-40154
  • report
    https://access.redhat.com/security/cve/CVE-2025-40248
  • report
    https://access.redhat.com/security/cve/CVE-2025-40277
  • report
    https://bugzilla.redhat.com/2402193
  • report
    https://bugzilla.redhat.com/2414494
  • report
    https://bugzilla.redhat.com/2418872
  • report
    https://bugzilla.redhat.com/2419954
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-1148.html