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High ALSA-2026:49213 4 CVEs

Important: kernel-rt security update

Published Jul 31, 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: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692)
* kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116)
* kernel: fanotify: fix false positive on permission events (CVE-2026-46150)
* kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle ()
* kernel: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle (CVE-2026-64530)

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 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.150.1.rt7.491.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.150.1.rt7.491.el8_10

Vulnerabilities 4

  • Critical 9.8
    CVE-2026-64530

    net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

    In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order frag…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-43116

    netfilter: ctnetlink: ensure safe access to master conntrack

    In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ensure safe access to master conntrack Holding reference on the expectation is not sufficient, the master conntrack object can just go away, making exp->master invalid. …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.1
    CVE-2026-46150

    fanotify: fix false positive on permission events

    In the Linux kernel, the following vulnerability has been resolved: fanotify: fix false positive on permission events fsnotify_get_mark_safe() may return false for a mark on an unrelated group, which results in bypassing the permission check. Fix by skipping …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Unscored —
    CVE-2026-31692

    rtnetlink: add missing netlink_ns_capable() check for peer netns

    In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan,…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-31692
  • report
    https://access.redhat.com/security/cve/CVE-2026-43116
  • report
    https://access.redhat.com/security/cve/CVE-2026-46150
  • report
    https://access.redhat.com/security/cve/CVE-2026-64530
  • report
    https://bugzilla.redhat.com/2464093
  • report
    https://bugzilla.redhat.com/2467005
  • report
    https://bugzilla.redhat.com/2482612
  • report
    https://bugzilla.redhat.com/2504052
  • report
    https://bugzilla.redhat.com/2507345
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-49213.html