CVE-2026-64541
Description
A flaw was found in the Linux kernel's Shared Memory Communications over RDMA (SMC-R) subsystem. A race condition allows a network socket to be released and freed while incoming messages are still being processed, leading to a use-after-free condition. A local attacker interacting with active SMC-R sessions can exploit this flaw to cause a kernel panic, resulting in a system crash and Denial of Service (DoS).
Statement
This vulnerability is rated as having a Moderate impact because exploitation requires a local user to interact with active Shared Memory Communications over RDMA (SMC-R) connections, primarily resulting in a denial of service via a kernel panic. The issue cannot be triggered remotely without established SMC sessions, and SMC protocols are not utilized in default Red Hat Enterprise Linux deployments without specialized RDMA hardware and explicit configuration. As a result, the blast radius is confined to systems actively running SMC-R workloads.
Mitigation
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | N/A | 9.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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