Critical Crash Vulnerability in Linux Kernel Affecting Debian Packages
Summary
CVE-2023-53394: In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: xsk: Fix crash on regular rq reactivation When the regular rq is reactivated after the XSK socket is closed it could be reading stale cqes wh... Affects linux versions 6.1.106-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing system resources and hardware communication. It provides essential services for all other software running on the system. This vulnerability specifically affects the networking subsystem, particularly the mlx5e driver, which handles Ethernet connections. The issue arises when the XSK socket is closed, leading to potential crashes and traffic disruptions.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the mlx5e driver related to the handling of XSK sockets. When the regular receive queue (rq) is reactivated after the XSK socket is closed, it may read stale completion queue entries (cqes), which can corrupt the rq. This corruption can result in the inability to receive traffic on the regular rq and may lead to a crash during subsequent operations. The issue was reported by Kal Cuttler Conely, highlighting a crash that occurs when the xdpsock sample program is stopped and restarted while traffic is running. The vulnerability has been assigned the identifier CVE-2023-53394.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, avoid reactivating the regular rq immediately after closing the XSK socket. This can help prevent the crash until the patch is applied.
Conclusion
The vulnerability CVE-2023-53394 in the Linux kernel poses a significant risk to systems running Debian packages, particularly affecting network operations. It is crucial to apply the available patch to ensure system stability and security. Users are encouraged to monitor their systems for vulnerabilities using tools like Vulert.
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FAQ
CVE-2023-53394 is a vulnerability in the Linux kernel that can cause crashes when handling XSK sockets in the mlx5e driver.
This vulnerability can lead to traffic disruptions and crashes in systems using the affected Linux kernel versions, particularly during network operations.
Yes, a patch is available in the form of Linux kernel version 6.4.11-1 for Debian 13 and 14.
You can use Vulert, which monitors open-source vulnerabilities in your software. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.
If an immediate update is not possible, avoid reactivating the regular rq after closing the XSK socket to minimize the risk of crashes.
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