RHSA-2026:45116
Vulnerability from csaf_redhat - Published: 2026-07-24 10:10 - Updated: 2026-10-30 09:25Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Important
Notes
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.
Details: 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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly limited
* kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)
* kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
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
30 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.147.1.rt7.488.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-kvm-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-kvm-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.147.1.rt7.488.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.147.1.rt7.488.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.
7.0 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2025-40026
Threats
Impact
Important
A flaw was found in the Linux kernel's device-mapper log (dm log) component. A local attacker could exploit an integer overflow vulnerability where a 64-bit value is truncated to 32 bits, leading to undersized memory allocations. This allows for out-of-bounds writes to kernel memory during log operations. Successful exploitation of this flaw can cause a kernel crash, resulting in a Denial of Service (DoS) for the affected system.
6.3 (Medium)
Affected products
Fixed
30 products, the same list as for
CVE-2025-40026
Threats
Impact
Moderate
A flaw was found in KVM in the Linux kernel. This vulnerability occurs due to improper validation of memory management unit (MMU) page roots after these pages are made available. An attacker could exploit this by triggering a scenario where KVM attempts to map memory into an invalid root, causing child shadow pages to inherit an invalid state. This violates KVM's internal integrity rules, potentially leading to system instability or a denial of service within the virtualized environment.
7.0 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2025-40026
Threats
Impact
Moderate
References
26 references
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"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.",
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"text": "kernel: KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O",
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"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"
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},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406712"
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-40026"
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{
"category": "external",
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{
"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"
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{
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"ids": [
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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tipc: fix double-free in tipc_buf_append()",
"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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"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.",
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"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.