RHSA-2026:70483 - 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 Important. 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: fanotify: fix false positive on permission events (CVE-2026-46150)
• kernel: netfilter: nat: use kfree_rcu to release ops (CVE-2026-53000)
• kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
• kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (CVE-2026-63888)
• kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
• kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)
• kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing (CVE-2026-64564)

Bug Fix(es) and Enhancement(s):

• WARNING: CPU: 5 PID: 20420 at net/core/stream.c:206 sk_stream_kill_queues+0xd2/0xe0 (JIRA:RHEL-256439)
• Backport 3e684903a857 - kpatch transition stalls on KVM vCPU threads running guest DPDK PMD [9.2.z] (JIRA:RHEL-258954)
• Backport request 747f7a2901174 [rhel-9.2.z] (JIRA:RHEL-259005)

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 - 2482612 - CVE-2026-46150 kernel: fanotify: fix false positive on permission events
• BZ - 2492273 - CVE-2026-53000 kernel: netfilter: nat: use kfree_rcu to release ops
• BZ - 2492437 - CVE-2026-52993 kernel: tipc: fix double-free in tipc_buf_append()
• BZ - 2502443 - CVE-2026-63888 kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
• BZ - 2502447 - CVE-2026-63887 kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
• BZ - 2507089 - CVE-2026-64268 kernel: Kernel: Remote out-of-bounds write in RDMA/siw
• BZ - 2510890 - CVE-2026-64564 kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing

CVEs

• CVE-2026-46150
• CVE-2026-52993
• CVE-2026-53000
• CVE-2026-63887
• CVE-2026-63888
• CVE-2026-64268
• CVE-2026-64564

References

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