- Issued:
- 2026-07-14
- Updated:
- 2026-08-04
RHSA-2026:39083 - Important: kernel security update
Synopsis
Important: kernel security update
Type/Severity
Security Advisory: Important
Topic
An update for kernel 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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
-
kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change (CVE-2025-71066)
-
kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089)
-
kernel: net: atm: fix crash due to unvalidated vcc pointer in sigd_send() (CVE-2026-31411)
-
kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)
-
kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113)
-
kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)
-
kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() 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.
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
| Product | Version | Arch |
|---|---|---|
| Red Hat Enterprise Linux for x86_64 | 8 | x86_64 |
| Red Hat Enterprise Linux for x86_64 - Extended Life Cycle | 8.10 | x86_64 |
| Red Hat Enterprise Linux for Power, little endian | 8 | ppc64le |
| Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle | 8.10 | ppc64le |
| Red Hat Enterprise Linux for IBM z Systems | 8 | s390x |
| Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle | 8.10 | s390x |
| Red Hat Enterprise Linux for ARM 64 | 8 | aarch64 |
| Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle | 8.10 | aarch64 |
| Red Hat CodeReady Linux Builder for x86_64 | 8 | x86_64 |
| Red Hat CodeReady Linux Builder for Power, little endian | 8 | ppc64le |
| Red Hat CodeReady Linux Builder for ARM 64 | 8 | aarch64 |
Updated Packages
- kernel-debuginfo-common-s390x-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-abi-stablelists-4.18.0-553.143.1.el8_10.noarch.rpm
- kernel-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-cross-headers-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debug-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- python3-perf-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-core-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-zfcpdump-core-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-modules-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-zfcpdump-devel-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-headers-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-zfcpdump-modules-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-tools-4.18.0-553.143.1.el8_10.aarch64.rpm
- bpftool-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debuginfo-common-ppc64le-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debuginfo-common-x86_64-4.18.0-553.143.1.el8_10.x86_64.rpm
- bpftool-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-debug-modules-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debug-modules-extra-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-core-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-devel-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-modules-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-zfcpdump-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-modules-extra-4.18.0-553.143.1.el8_10.ppc64le.rpm
- perf-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-modules-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-tools-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-core-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-devel-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debug-core-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debuginfo-common-aarch64-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-tools-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debug-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-tools-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-core-4.18.0-553.143.1.el8_10.aarch64.rpm
- perf-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debug-4.18.0-553.143.1.el8_10.aarch64.rpm
- perf-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-tools-libs-devel-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-modules-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-tools-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-debug-devel-4.18.0-553.143.1.el8_10.aarch64.rpm
- python3-perf-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-tools-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-modules-extra-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-devel-4.18.0-553.143.1.el8_10.s390x.rpm
- perf-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-zfcpdump-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-4.18.0-553.143.1.el8_10.src.rpm
- kernel-debug-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-modules-extra-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-modules-extra-4.18.0-553.143.1.el8_10.x86_64.rpm
- perf-4.18.0-553.143.1.el8_10.x86_64.rpm
- bpftool-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-devel-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-headers-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debug-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-modules-extra-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-tools-4.18.0-553.143.1.el8_10.x86_64.rpm
- perf-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-headers-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-tools-libs-devel-4.18.0-553.143.1.el8_10.aarch64.rpm
- perf-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- python3-perf-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-doc-4.18.0-553.143.1.el8_10.noarch.rpm
- perf-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- python3-perf-4.18.0-553.143.1.el8_10.x86_64.rpm
- python3-perf-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-cross-headers-4.18.0-553.143.1.el8_10.aarch64.rpm
- python3-perf-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debug-modules-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-debug-core-4.18.0-553.143.1.el8_10.ppc64le.rpm
- bpftool-4.18.0-553.143.1.el8_10.s390x.rpm
- bpftool-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debuginfo-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-tools-libs-devel-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-cross-headers-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-debug-core-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-devel-4.18.0-553.143.1.el8_10.x86_64.rpm
- python3-perf-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debug-devel-4.18.0-553.143.1.el8_10.s390x.rpm
- bpftool-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-debug-modules-4.18.0-553.143.1.el8_10.aarch64.rpm
- bpftool-debuginfo-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-cross-headers-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-devel-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-headers-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-tools-libs-4.18.0-553.143.1.el8_10.x86_64.rpm
- kernel-debug-debuginfo-4.18.0-553.143.1.el8_10.aarch64.rpm
- kernel-tools-debuginfo-4.18.0-553.143.1.el8_10.ppc64le.rpm
- python3-perf-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-modules-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-modules-extra-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-debug-modules-extra-4.18.0-553.143.1.el8_10.s390x.rpm
- kernel-zfcpdump-modules-extra-4.18.0-553.143.1.el8_10.s390x.rpm
- bpftool-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-core-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-tools-libs-4.18.0-553.143.1.el8_10.ppc64le.rpm
- kernel-tools-libs-4.18.0-553.143.1.el8_10.aarch64.rpm
Fixes
- This content is not included.BZ - 2429036
- This content is not included.BZ - 2429104
- This content is not included.BZ - 2456521
- This content is not included.BZ - 2480453
- This content is not included.BZ - 2482587
- This content is not included.BZ - 2485368
- This content is not included.BZ - 2492805
- This content is not included.BZ - 2497033
CVEs
- CVE-2025-71066
- CVE-2025-71089
- CVE-2026-31411
- CVE-2026-43499
- CVE-2026-46113
- CVE-2026-53166
- CVE-2026-53266
- This content is not included.CVE-2026-53359
References
Additional information
- The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at Security Contacts and Procedures.
- Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.