RHSA-2026:94558 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

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.

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: 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: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)
• kernel: dm cache policy smq: fix missing locks in invalidating cache blocks (CVE-2026-53062)
• kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)
• kernel: netfilter: synproxy: refresh tcphdr after skb_ensure_writable (CVE-2026-64007)
• kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path (CVE-2026-64534)
• kernel: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer (CVE-2026-74556)
• kernel: nvme-tcp: fix host memory disclosure on R2T for a read command (CVE-2026-89481)
• 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):

• The Kernel panic occurred at strlen+0x0 because a race event filter treats the user space pointer as a normal pointer (JIRA:RHEL-291138)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 x86_64

Fixes

• BZ - 2429036 - CVE-2025-71066 kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change
• BZ - 2464462 - CVE-2026-43051 kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
• BZ - 2484477 - CVE-2026-46259 kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()
• BZ - 2492278 - CVE-2026-53062 kernel: dm cache policy smq: fix missing locks in invalidating cache blocks
• BZ - 2492447 - CVE-2026-53073 kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
• BZ - 2502361 - CVE-2026-64007 kernel: netfilter: synproxy: refresh tcphdr after skb_ensure_writable
• BZ - 2507399 - CVE-2026-64534 kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
• BZ - 2517010 - CVE-2026-74556 kernel: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer
• BZ - 2532184 - CVE-2026-89481 kernel: nvme-tcp: fix host memory disclosure on R2T for a read command
• BZ - 2553390 - CVE-2026-98432 kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period
• BZ - 2559835 - kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability

CVEs

• CVE-2025-71066
• CVE-2026-43051
• CVE-2026-46259
• CVE-2026-53062
• CVE-2026-53073
• CVE-2026-64007
• CVE-2026-64534
• CVE-2026-74556
• CVE-2026-89481
• CVE-2026-98432

References

• https://access.redhat.com/security/updates/classification/#critical