RHSA-2026:36049 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.

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: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (CVE-2026-23216)
• kernel: gfs2: Fix use-after-free in iomap inline data write path (CVE-2026-45984)
• kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path (CVE-2026-46189)

Bug Fix(es) and Enhancement(s):

• [RHEL 8.10.z] Add an .sbat section to the x86 kernel (JIRA:RHEL-182788)
• Incorrect message "NFS: Server wrote zero bytes" is shown in the logs (JIRA:RHEL-147665)

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.

Affected Products

• Red Hat Enterprise Linux for Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2440630 - CVE-2026-23216 kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()
• BZ - 2481922 - CVE-2026-45984 kernel: gfs2: Fix use-after-free in iomap inline data write path
• BZ - 2482588 - CVE-2026-46189 kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path

CVEs

• CVE-2026-23216
• CVE-2026-45984
• CVE-2026-46189

References

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