RHSA-2026:43826HighCVSS 7.8

Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 security update

Published
July 22, 2026
Last Modified
August 31, 2026

🔗 CVE IDs covered (3)

CVE-2026-53362 →CVE-2026-46242 →CVE-2026-53359 →

📋 Description

CVE-2026-46242 — kernel: eventpoll: fix ep_remove struct eventpoll / struct file UAF CVE-2026-53359 — kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role CVE-2026-53362 — kernel: kernel: ipv6 frag escape

🎯 Affected products7

  • Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-4.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-4.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-4.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debugsource-0:1-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: This vulnerability can be mitigated by disabling nested virtualization. Create a file in `/etc/modprobe.d/` with a descriptive name, such as `cve-2026-53359-mitigation.conf`. In that file, disable nested virtualization for the `kvm_intel` and `kvm_amd` kernel modules: ``` options kvm-intel nested=0 options kvm-amd nested=0 ``` Use `lsmod` to determine if either module is already loaded. If so, remove loaded modules with `modprobe -r`. To validate that nested virtualization is disabled, read the files `/sys/module/kvm_intel/parameters/nested` and `/sys/module/kvm_amd/parameters/nested`. If these modules are loaded, those files should read `N` to indicate that the feature is disabled. In OpenShift 4, a MachineConfig can be utilized to create a modprobe configuration allowing control of the module on applicable nodes. See the following article for an example. https://access.redhat.com/solutions/6979679 Workaround: See the security bulletin for a detailed mitigation procedure.

🔗 References (6)