Kernel Vulnerability in Linux Package: DMA Table Overflow in pata_macio
Summary
DEBIAN-CVE-2024-44976: In the Linux kernel, the following vulnerability has been resolved: ata: pata_macio: Fix DMA table overflow Kolbjørn and Jonáš reported that their 32-bit PowerMacs were crashing in pata-macio since commit 09fe2bfa6b83 ("... Affects linux versions < 6.10.7-1. Fixed in 6.10.7-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It supports a wide range of hardware architectures and is known for its stability and performance. The vulnerability in question affects the pata_macio driver, which is responsible for managing ATA devices on PowerMac systems. This vulnerability can lead to system crashes and instability, particularly in 32-bit PowerMacs.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the pata_macio driver, which can cause a DMA table overflow. This issue arises from an increase in max_segment_size to 64KB, which, under certain conditions, leads to the splitting of requests into multiple commands in the DMA table. If the request size exceeds the limit, it can trigger a kernel BUG, resulting in system crashes. The vulnerability was reported by Kolbjørn and Jonás, who experienced crashes on their 32-bit PowerMacs after a specific commit.
How To Fix
Minimum fixed version
6.10.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can revert to the previous max_segment_size setting for 4KB kernels. This can be done by modifying the kernel parameters or configuration files, but it is recommended to apply the patch as the best solution.
Conclusion
The vulnerability in the pata_macio driver of the Linux kernel poses significant risks to 32-bit PowerMac systems, leading to potential system crashes and instability. Users are strongly advised to update their Linux packages to the patched version 6.10.7-1 to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
The pata_macio driver is a component of the Linux kernel that manages ATA devices on PowerMac systems, facilitating communication between the operating system and hardware.
The primary symptom of this vulnerability is system crashes or kernel panics on affected 32-bit PowerMac systems when using the pata_macio driver.
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 by this vulnerability without needing to sign up.
Yes, system crashes caused by this vulnerability can potentially lead to data loss if unsaved work is present at the time of the crash.
If immediate updates are not possible, consider applying the temporary workaround by reverting to the previous max_segment_size setting, but prioritize applying the patch as soon as feasible.
References
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