RHSA-2026:94438 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 (CVE-2025-21702)

• kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change (CVE-2025-71066)

• kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)

• kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086)

• kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)

• kernel: sctp: validate embedded INIT chunk and address list lengths in cookie (CVE-2026-53224)

• kernel: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (CVE-2026-53246)

• kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)

• kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability ()

Bug Fix(es) and Enhancement(s):

• RHEL9: Fix downstream-only regression from 532af53c [rhel-9.6.z] (JIRA:RHEL-192429)

• RHEL 9: Backport b95e0e792822 [rhel-9.6.z] (JIRA:RHEL-216469)

• Hard lockup experienced with repro from RHEL-282072 [rhel-9.6.z] (JIRA:RHEL-290029)

• The Kernel panic occurred at strlen+0x0 because a race event filter treats the user space pointer as a normal pointer [rhel-9.6.z] (JIRA:RHEL-291140)

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.