DMA RX Overflow Workaround in Linux Kernel - CVE-2023-52834
Summary
CVE-2023-52834: In the Linux kernel, the following vulnerability has been resolved: atl1c: Work around the DMA RX overflow issue This is based on alx driver commit 881d0327db37 ("net: alx: Work around the DMA RX overflow issue"). Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, providing essential services for hardware management, process scheduling, and system calls. It supports a wide range of hardware architectures and is known for its stability and performance. The vulnerability CVE-2023-52834 affects the atl1c and alx network drivers, which are responsible for managing network interfaces. This issue arises from a DMA RX overflow error, leading to potential data corruption and system instability.
Vulnerability Detail
CVE-2023-52834 is a vulnerability in the Linux kernel related to the atl1c and alx network drivers. The issue stems from a DMA RX overflow error that can occur when certain addresses are accessed, potentially leading to data corruption and system crashes. The vulnerability was identified due to the lack of testing for the atl1c driver, which did not implement the same workaround as the alx driver. The vulnerability can affect systems using the AR8131 chipset, particularly on Acer 4540 models.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can check the allocated skb address and use skb_reserve() to move away from the problematic address (0x...fc0). This method avoids the use of a custom allocator and mitigates the RX overflow issue until a proper fix is applied.
Conclusion
CVE-2023-52834 is a significant vulnerability in the Linux kernel that affects network drivers, leading to potential data corruption and system instability. Users are advised to update their systems to the fixed kernel versions or apply the provided workaround until an update can be performed. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software.
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FAQ
CVE-2023-52834 is a vulnerability in the Linux kernel affecting the atl1c and alx network drivers, related to a DMA RX overflow error.
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The vulnerability can lead to data corruption and system instability, particularly affecting network operations.
The fixed versions are 6.1.64-1 for Debian 12 and 6.6.8-1 for Debian 13.
Yes, a workaround involves checking the allocated skb address and using skb_reserve() to avoid the problematic address.
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