RHSA-2026:39983: Moderate: kernel-rt security update

Published Jul 15, 2026
·
Updated

Moderate: kernel-rt security update

Other sources

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: netfilter: nfconntrackhelper: pass helper to expect cleanup (CVE-2026-43027) kernel: rtmutex: Use waiter::task instead of current in removewaiter() (CVE-2026-43499) kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113) kernel: futex/requeue: Prevent NULL pointer dereference in removewaiter() on self-deadlock (CVE-2026-53166) kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359) 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.

— Red Hat

Affected Software

19 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
redhat/kernel-rt<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-core<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-core<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-debuginfo<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-devel<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-kvm<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-modules<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-modules-core<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debug-modules-extra<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-debuginfo<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-devel<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-kvm<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-modules<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-modules-core<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2
redhat/kernel-rt-modules-extra<5.14.0-284.181.1.rt14.466.el9_2
5.14.0-284.181.1.rt14.466.el9_2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  2. Upgrade

    Upgrade redhat/kernel-rt-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  3. Upgrade

    Upgrade redhat/kernel-rt-debug to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  4. Upgrade

    Upgrade redhat/kernel-rt-debug-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  5. Upgrade

    Upgrade redhat/kernel-rt-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  6. Upgrade

    Upgrade redhat/kernel-rt-debug-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  7. Upgrade

    Upgrade redhat/kernel-rt-debug-kvm to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  8. Upgrade

    Upgrade redhat/kernel-rt-debug-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  9. Upgrade

    Upgrade redhat/kernel-rt-debug-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  10. Upgrade

    Upgrade redhat/kernel-rt-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  11. Upgrade

    Upgrade redhat/kernel-rt-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  12. Upgrade

    Upgrade redhat/kernel-rt-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  13. Upgrade

    Upgrade redhat/kernel-rt-kvm to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  14. Upgrade

    Upgrade redhat/kernel-rt-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  15. Upgrade

    Upgrade redhat/kernel-rt-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  16. Upgrade

    Upgrade redhat/kernel-rt-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-284.181.1.rt14.466.el9_2
  17. Upgrade

    Upgrade Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2: kernel-rt to a version that resolves this vulnerability.

    Fixed in kernel-rt-5.14.0-284.181.1.rt14.466.el9_2

Event History

Jul 15, 2026
Advisory Published
via Red Hat·01:34 PM
Data Sourced
via Red Hat·01:34 PM
DescriptionSeverityAffected Software
Jul 21, 2026
Advisory Published
via Red Hat·02:04 PM
Data Sourced
via Red Hat·02:04 PM
Remedy

Frequently Asked Questions

1

What is the severity of RHSA-2026:39983?

The severity of RHSA-2026:39983 is classified as medium with a score of 4.

2

What security vulnerabilities are addressed in RHSA-2026:39983?

RHSA-2026:39983 addresses a security vulnerability related to netfilter and rtmutex, as identified in CVE-2026-43027.

3

How do I fix RHSA-2026:39983?

To fix RHSA-2026:39983, update the kernel-rt packages to the latest version provided by Red Hat.

4

What systems are affected by RHSA-2026:39983?

RHSA-2026:39983 affects systems running Red Hat Enterprise Linux for x86_64 and related Real Time Linux Kernel packages.

5

What are the potential impacts of not addressing RHSA-2026:39983?

Failing to address RHSA-2026:39983 could lead to security vulnerabilities such as use after free and null pointer dereference issues.

Company

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