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High ALSA-2026:0443 3 CVEs

Important: kernel-rt security update

Published Jan 12, 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: media: rc: fix races with imon_disconnect() (CVE-2025-39993)
* kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240)
* kernel: libceph: fix potential use-after-free in have_mon_and_osd_map() (CVE-2025-68285)

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 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.92.1.rt7.433.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.92.1.rt7.433.el8_10

Vulnerabilities 3

  • Critical 9.8
    CVE-2025-68285

    libceph: fix potential use-after-free in have_mon_and_osd_map()

    In the Linux kernel, the following vulnerability has been resolved: libceph: fix potential use-after-free in have_mon_and_osd_map() The wait loop in __ceph_open_session() can race with the client receiving a new monmap or osdmap shortly after the initial map …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-39993

    media: rc: fix races with imon_disconnect()

    In the Linux kernel, the following vulnerability has been resolved: media: rc: fix races with imon_disconnect() Syzbot reports a KASAN issue as below: BUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline] BUG: KASAN: use-after-free in …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.5
    CVE-2025-40240

    sctp: avoid NULL dereference when chunk data buffer is missing

    In the Linux kernel, the following vulnerability has been resolved: sctp: avoid NULL dereference when chunk data buffer is missing chunk->skb pointer is dereferenced in the if-block where it's supposed to be NULL only. chunk->skb can only be NULL if chunk->he…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-39993
  • report
    https://access.redhat.com/security/cve/CVE-2025-40240
  • report
    https://access.redhat.com/security/cve/CVE-2025-68285
  • report
    https://bugzilla.redhat.com/2404121
  • report
    https://bugzilla.redhat.com/2418832
  • report
    https://bugzilla.redhat.com/2422801
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-0443.html