Critical Use-After-Free Vulnerability in Linux Kernel (Debian:13 and Debian:14)
Summary
DEBIAN-CVE-2024-47711: In the Linux kernel, the following vulnerability has been resolved: af_unix: Don't return OOB skb in manage_oob(). Affects linux versions < 6.11.2-1. Fixed in 6.11.2-1. 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 is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to severe system compromises. This specific vulnerability affects the Linux kernel versions prior to 6.11.2-1 in both Debian 13 and Debian 14 distributions.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability was identified in the af_unix module, specifically in the manage_oob() function. This issue arises when Out-Of-Band (OOB) data is mishandled during the reception of messages. The vulnerability allows an attacker to exploit the situation where the consumed OOB data remains in the receive queue, leading to potential memory corruption and arbitrary code execution. The vulnerability was reported by syzbot and is linked to a specific sequence of send and receive operations that can trigger the flaw.
How To Fix
Minimum fixed version
6.11.2-1
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 avoid using Out-Of-Band (OOB) messaging until the kernel is updated. This can be done by modifying application code to refrain from sending or receiving OOB data, thus mitigating the risk of exploitation.
Conclusion
The identified use-after-free vulnerability in the Linux kernel poses significant risks to systems running Debian 13 and Debian 14. Immediate action is recommended to update to the patched version to safeguard against potential exploitation. Users should also consider temporary workarounds to mitigate risks until the update can be applied.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially leading to memory corruption and exploitation.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor for open-source vulnerabilities without requiring any installation.
Exploitation of this vulnerability can lead to arbitrary code execution, system crashes, and unauthorized access to sensitive data.
Yes, temporarily avoid using Out-Of-Band messaging in your applications until the kernel is updated to the patched version.
If immediate updates are not possible, ensure that your system is behind a firewall and monitor for any unusual activity while planning for an update.
References
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