RDMA/ucma: Protect mc during concurrent multicast leaves in Kernel
Summary
GSD-2022-1000582: RDMA/ucma: Protect mc during concurrent multicast leaves. Affects Kernel versions >= 95fe51096b7adf1d1e7315c49c75e2f75f162584, < 2923948ffe0835f7114e948b35bcc42bc9b3baa1. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system. It provides the core functionality and interfaces for various hardware devices, drivers, and system services. The RDMA/ucma (Remote Direct Memory Access/Unified Communication Management API) subsystem within the Kernel enables efficient communication between remote systems using RDMA technology. It allows applications to establish and manage connections, perform data transfers, and utilize other RDMA features. However, a vulnerability has been identified in the RDMA/ucma subsystem that could potentially be exploited by attackers.
Vulnerability Detail
The vulnerability in the RDMA/ucma subsystem arises during concurrent multicast leaves. It is caused by a lack of proper protection for the multicast (mc) object, which can lead to race conditions and memory corruption. An attacker could potentially exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The vulnerability was introduced in version v5.10 of the Linux Kernel and is fixed in version v5.15.22.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.22 or later. This can be done by obtaining the latest stable version of the Kernel source code from the official Git repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and following the instructions provided for building and installing the Kernel. Alternatively, users can wait for their Linux distribution to release an updated package containing the fixed version of the Kernel.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The vulnerability in the RDMA/ucma subsystem of the Kernel could potentially allow attackers to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. It is crucial to update the Linux Kernel to version v5.15.22 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability could potentially allow attackers to execute arbitrary code, escalate privileges, or cause a denial-of-service condition.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the playground will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix or update to mitigate the risk.
The recommended mitigation is to update the Linux Kernel to version v5.15.22 or later. This will address the vulnerability and protect against potential exploitation.
For more details about this vulnerability, you can refer to the vulnerability ID GSD-2022-1000582 in the GSD database maintained by the Cloud Security Alliance. The source link is provided in the database-specific information of this report.
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