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OpenAdvisories
High ALSA-2026:39180 3 CVEs

Important: kernel-rt security update

Published Jul 14, 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: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086)
* kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116)
* kernel: XFS data corruption using reflink ()

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 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.144.1.rt7.485.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.144.1.rt7.485.el8_10

Vulnerabilities 3

  • High 7.8
    CVE-2026-46116

    xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete

    In the Linux kernel, the following vulnerability has been resolved: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete KASAN reproduces a slab-use-after-free in __xfrm_state_delete()'s hlist_del_rcu calls under syzkaller load on linux-6.12.y sta…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-64600 Public exploit

    xfs: resample the data fork mapping after cycling ILOCK

    In the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, thes…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Unscored —
    CVE-2026-46086

    net: bridge: use a stable FDB dst snapshot in RCU readers

    In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by `fdb_delete_local()`, which updates `f->dst` to another port or to `NULL` while keepin…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-46086
  • report
    https://access.redhat.com/security/cve/CVE-2026-46116
  • report
    https://bugzilla.redhat.com/2481989
  • report
    https://bugzilla.redhat.com/2482523
  • report
    https://bugzilla.redhat.com/2498915
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-39180.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2026-64600.html