Kernel-Rt Security Update — AlmaLinux 8 (ALSA-2026:89082)

Type:

security

Severity:

important

Release date:

2026-10-26

Description:

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: tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236)
* kernel: fuse: re-lock request before replacing page cache folio (CVE-2026-53388)
* kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs() (CVE-2026-64378)
* kernel: net: gro: fix double aggregation of flush-marked skbs (CVE-2026-68136)
* kernel: net/packet: avoid fanout hook re-registration after unregister (CVE-2026-68338)
* kernel: net/iucv: fix use-after-free of a severed iucv_path (CVE-2026-68140)
* kernel: net/sched: serialize qdisc_rtab_list against concurrent get/put (CVE-2026-68138)
* kernel: ipvs: reload ip header after head reallocation (CVE-2026-68476)
* kernel: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() (CVE-2026-72242)
* kernel: mptcp: options: reset DSS fields in case of unexpected size (CVE-2026-80586)
* kernel: usb: usbfs: fix use-after-free of usb_device in usbdev_release() (CVE-2026-80824)
* kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638)
* kernel: net/iucv: filter frames in afiucv_hs_rcv() by ingress device (CVE-2026-81003)
* kernel: ipv4: validate checksum_start before completing checksum (CVE-2026-99999)

Bug Fix(es) and Enhancement(s):

* Backport 6785011f8b16 (“ipv4: validate checksum_start before completing checksum”) [almalinux-8.10.z] (JIRA:AlmaLinux-280584)

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.

References:

• CVE-2026-53236
• CVE-2026-53388
• CVE-2026-64378
• CVE-2026-68136
• CVE-2026-68138
• CVE-2026-68140
• CVE-2026-68338
• CVE-2026-68476
• CVE-2026-72242
• CVE-2026-80586
• CVE-2026-80824
• CVE-2026-81003
• CVE-2026-89638
• CVE-2026-99999
• RHSA-2026:89082
• ALSA-2026:89082

Updated packages listed below:

Notes:

This page is generated automatically from Red Hat security data and has not been checked for errors. For clarification or corrections please contact the AlmaLinux Packaging Team.