Critical Vulnerability in Linux Kernel: RDMA/EFA IRQ Handling Flaw
Summary
DEBIAN-CVE-2026-98430: In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Keep admin queues alive while IRQ is registered The management IRQ handler accesses both the admin completion queue and the async event queue. Affects linux versions 6.1.106-1 – 7.3~rc6-1~exp1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It manages system resources, facilitates communication between hardware and software, and ensures system stability. The kernel's robustness is critical for system performance and security. However, vulnerabilities can arise, such as the one identified in the RDMA/EFA subsystem, which affects the handling of admin queues and IRQs, potentially compromising system integrity.
Vulnerability Detail
In the Linux kernel, a vulnerability was identified in the RDMA/EFA subsystem where the management IRQ handler improperly accessed both the admin completion queue and the async event queue. The driver registered the IRQ before constructing these queues and destroyed them before freeing the IRQ, leading to a situation where the handler's lifetime was not properly managed. This flaw could allow for unauthorized access or manipulation of system resources, posing a significant risk to system security and stability.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary measure, users can mask the IRQ during the initialization of the queues and ensure that the device is reset before destroying the queues if IRQ registration fails. This can help mitigate the risk until the system is updated with the patched version.
Conclusion
The vulnerability in the Linux kernel's RDMA/EFA subsystem poses significant risks to system security and stability. It is crucial for users to update their systems to the patched version to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time, ensuring that systems remain secure.
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FAQ
The vulnerability involves improper handling of IRQs in the RDMA/EFA subsystem, which can lead to unauthorized access to system resources.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
If exploited, this vulnerability could allow attackers to manipulate system resources, leading to system instability or unauthorized access.
Yes, a patched version of the Linux package is available. For Debian 14, the fixed version is 7.2.8-1.
As a workaround, ensure that IRQs are masked during queue initialization and reset the device before destroying queues if IRQ registration fails.
References
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