RHSA-2026:59091
Vulnerability from csaf_redhat - Published: 2026-08-24 14:37 - Updated: 2026-08-26 22:04Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.
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.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
* kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518)
* kernel: selinux: fix overlayfs mmap() and mprotect() access checks (CVE-2026-46054)
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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the Kernel-based Virtual Machine (KVM) for x86. This vulnerability occurs when KVM incorrectly re-checks Level 1 (L1) intercepts during the completion of userspace I/O emulation for a Level 2 (L2) instruction. If the L1 or host userspace modifies I/O interception settings during this process, KVM may misinterpret already-emulated I/O as intercepted. This can lead to a kernel warning and potentially disrupt the guest virtual machine, resulting in a denial of service. Exploitation requires local access to /dev/kvm and the ability to perform nested virtualization or manipulate I/O bitmaps.
5.5 (Medium)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.201.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-common-x86_64-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-doc-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-libs-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.201.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-abi-stablelists-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-common-x86_64-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-doc-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-libs-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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Threats
Impact
Moderate
A flaw was found in AMD Zen 2-based processors, affecting components such as the kernel and Xen hypervisor. Improper isolation of shared resources within the CPU operation cache could allow an attacker to corrupt instructions executed at a different privilege level. This could potentially result in privilege escalation, granting an attacker higher system access than intended.
7.0 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.201.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-common-x86_64-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-devel-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-doc-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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Threats
Impact
Important
A flaw was found in the Linux kernel's Distributed Lock Manager (dlm) module. An attacker could send specially crafted network messages with an oversized length parameter to the dlm_dump_rsb_name() function. This lack of validation can lead to an out-of-bounds write in the dlm_search_rsb_tree() function, potentially causing a buffer overflow. This vulnerability could allow for denial of service or, in some cases, arbitrary code execution.
7.0 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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Threats
Impact
Important
A flaw was found in the Linux kernel's SELinux security module when handling overlayfs. The existing security model for overlayfs does not properly enforce access controls for `mmap()` and `mprotect()` operations. This oversight could allow a local attacker to bypass intended security policies, potentially leading to unauthorized access to files within an overlayfs filesystem. The vulnerability is resolved by enhancing backing file enforcement for `mmap()` and leveraging new LSM (Linux Security Module) capabilities for `mprotect()` access controls.
7.0 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-common-x86_64-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-doc-0:4.18.0-305.201.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-extra-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-libs-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-debuginfo-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-0:4.18.0-305.201.1.el8_4.x86_64 | — |
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Threats
Impact
Important
References
29 references
{
"document": {
"aggregate_severity": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"text": "Important"
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"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
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"lang": "en",
"notes": [
{
"category": "summary",
"text": "An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.\n\nRed 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.",
"title": "Topic"
},
{
"category": "general",
"text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)\n\n* kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)\n\n* kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518)\n\n* kernel: selinux: fix overlayfs mmap() and mprotect() access checks (CVE-2026-46054)\n\nFor 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.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
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"contact_details": "https://access.redhat.com/security/team/contact/",
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"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_59091.json"
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"title": "Red Hat Security Advisory: kernel security update",
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{
"cve": "CVE-2025-40026",
"cwe": {
"id": "CWE-754",
"name": "Improper Check for Unusual or Exceptional Conditions"
},
"discovery_date": "2025-10-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2406712"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Kernel-based Virtual Machine (KVM) for x86. This vulnerability occurs when KVM incorrectly re-checks Level 1 (L1) intercepts during the completion of userspace I/O emulation for a Level 2 (L2) instruction. If the L1 or host userspace modifies I/O interception settings during this process, KVM may misinterpret already-emulated I/O as intercepted. This can lead to a kernel warning and potentially disrupt the guest virtual machine, resulting in a denial of service. Exploitation requires local access to /dev/kvm and the ability to perform nested virtualization or manipulate I/O bitmaps.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "KVM x86 was re-checking L1 instruction intercepts while completing a userspace I/O emulation for an L2 instruction. If L1 (or host userspace) modified I/O interception during the exit, KVM could wrongly treat the already-emulated I/O as intercepted and leave vcpu-\u003earch.pio.count non-zero, triggering a WARN and potentially disrupting the guest.\nPractical exploitation requires local access to /dev/kvm and the ability to run nested virtualization or manipulate I/O bitmaps.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40026"
},
{
"category": "external",
"summary": "RHBZ#2406712",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406712"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40026",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40026"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40026",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40026"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025102841-CVE-2025-40026-760b@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025102841-CVE-2025-40026-760b@gregkh/T"
}
],
"release_date": "2025-10-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-24T14:37:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s 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\u0027 overall security posture.\n\nBecause 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\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"url": "https://access.redhat.com/errata/RHSA-2026:59091"
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"details": "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:\n```\noptions kvm-intel nested=0\noptions kvm-amd nested=0\n```\n\nUse `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.\n\nIn 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.\n\nhttps://access.redhat.com/solutions/6979679",
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"category": "impact",
"details": "Moderate"
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"title": "kernel: KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O"
},
{
"cve": "CVE-2025-54518",
"cwe": {
"id": "CWE-1220",
"name": "Insufficient Granularity of Access Control"
},
"discovery_date": "2026-05-15T05:01:27.379831+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2477784"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in AMD Zen 2-based processors, affecting components such as the kernel and Xen hypervisor. Improper isolation of shared resources within the CPU operation cache could allow an attacker to corrupt instructions executed at a different privilege level. This could potentially result in privilege escalation, granting an attacker higher system access than intended.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-54518"
},
{
"category": "external",
"summary": "RHBZ#2477784",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477784"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-54518",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-54518"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-54518",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54518"
},
{
"category": "external",
"summary": "http://www.openwall.com/lists/oss-security/2026/05/12/15",
"url": "http://www.openwall.com/lists/oss-security/2026/05/12/15"
},
{
"category": "external",
"summary": "http://xenbits.xen.org/xsa/advisory-490.html",
"url": "http://xenbits.xen.org/xsa/advisory-490.html"
},
{
"category": "external",
"summary": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-7052.html",
"url": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-7052.html"
}
],
"release_date": "2026-05-15T03:06:30.822000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-24T14:37:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s 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\u0027 overall security posture.\n\nBecause 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\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"title": "kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation"
},
{
"cve": "CVE-2026-43125",
"cwe": {
"id": "CWE-130",
"name": "Improper Handling of Length Parameter Inconsistency"
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"discovery_date": "2026-05-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467234"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Distributed Lock Manager (dlm) module. An attacker could send specially crafted network messages with an oversized length parameter to the dlm_dump_rsb_name() function. This lack of validation can lead to an out-of-bounds write in the dlm_search_rsb_tree() function, potentially causing a buffer overflow. This vulnerability could allow for denial of service or, in some cases, arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: dlm: validate length in dlm_search_rsb_tree",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-43125"
},
{
"category": "external",
"summary": "RHBZ#2467234",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467234"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43125",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43125"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43125",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43125"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050619-CVE-2026-43125-c9f9@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050619-CVE-2026-43125-c9f9@gregkh/T"
}
],
"release_date": "2026-05-06T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-24T14:37:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s 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\u0027 overall security posture.\n\nBecause 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\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"title": "kernel: dlm: validate length in dlm_search_rsb_tree"
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{
"cve": "CVE-2026-46054",
"cwe": {
"id": "CWE-280",
"name": "Improper Handling of Insufficient Permissions or Privileges"
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"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "2482025"
}
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"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s SELinux security module when handling overlayfs. The existing security model for overlayfs does not properly enforce access controls for `mmap()` and `mprotect()` operations. This oversight could allow a local attacker to bypass intended security policies, potentially leading to unauthorized access to files within an overlayfs filesystem. The vulnerability is resolved by enhancing backing file enforcement for `mmap()` and leveraging new LSM (Linux Security Module) capabilities for `mprotect()` access controls.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: selinux: fix overlayfs mmap() and mprotect() access checks",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-46054"
},
{
"category": "external",
"summary": "RHBZ#2482025",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482025"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-46054",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-46054"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46054",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46054"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026052754-CVE-2026-46054-b185@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026052754-CVE-2026-46054-b185@gregkh/T"
}
],
"release_date": "2026-05-27T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-24T14:37:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s 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\u0027 overall security posture.\n\nBecause 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\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:59091"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: selinux: fix overlayfs mmap() and mprotect() access checks"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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