RHSA-2026:77500
Vulnerability from csaf_redhat - Published: 2026-10-07 12:09 - Updated: 2026-10-07 17:19Summary
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: vsock/vmci: fix UAF when peer resets connection during handshake (CVE-2026-64115)
* kernel: packet: use consistent hard_header_len in non-ring send paths ()
* kernel: packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)
* kernel: svcrdma: Reject inline replies that overflow the pull-up buffer (CVE-2026-89530)
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 `vsock/vmci` component of the Linux kernel. A remote attacker could exploit a Use-After-Free (UAF) vulnerability when a peer resets a connection during the handshake process. This occurs because the system incorrectly handles reset packets, leading to a pending socket being left in an invalid state. Exploiting this flaw could cause a system crash, resulting in a Denial of Service (DoS).
7.0 (High)
Affected products
Fixed
30 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.172.1.rt7.513.el8_10.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-kvm-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-kvm-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.172.1.rt7.513.el8_10.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.172.1.rt7.513.el8_10.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
An out-of-bounds write problem was observed in packet_sendmsg_spkt in net/packet/af_packet.c in the Linux Kernel. In this flaw, AF_PACKET hard_header_len race may allow local privilege escalation.
7.8 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-64115
Threats
Impact
Important
A flaw was found in the Linux kernel's svcrdma component, which handles network communication using Remote Direct Memory Access (RDMA). A remote attacker can send a specially crafted network reply that is larger than expected. This can cause the system to write data beyond the intended memory area, leading to memory corruption. This vulnerability could allow an attacker to cause a denial of service or potentially execute arbitrary code.
7.0 (High)
Affected products
Fixed
30 products, the same list as for
CVE-2026-64115
Threats
Impact
Important
References
22 references
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"text": "A flaw was found in the `vsock/vmci` component of the Linux kernel. A remote attacker could exploit a Use-After-Free (UAF) vulnerability when a peer resets a connection during the handshake process. This occurs because the system incorrectly handles reset packets, leading to a pending socket being left in an invalid state. Exploiting this flaw could cause a system crash, resulting in a Denial of Service (DoS).",
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"text": "kernel: vsock/vmci: fix UAF when peer resets connection during handshake",
"title": "Vulnerability summary"
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{
"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.",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: svcrdma: Reject inline replies that overflow the pull-up buffer"
}
]
}
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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.
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.
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