Critical Vulnerability in Linux Package: Improper Check in virtio_net_hdr_to_skb Function
Summary
DEBIAN-CVE-2024-49947: In the Linux kernel, the following vulnerability has been resolved: net: test for not too small csum_start in virtio_net_hdr_to_skb() syzbot was able to trigger this warning [1], after injecting a malicious packet throug... Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, providing essential services for hardware and software interaction. It supports a wide range of functionalities, including process management, memory management, and device control. The kernel is crucial for system stability and security, making it vital to address any vulnerabilities that may arise.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the virtio_net_hdr_to_skb function, where an improper check for the csum_start value can lead to incorrect transport header settings. This issue was triggered by injecting a malicious packet through af_packet, which could manipulate skb->csum_start. The vulnerability can potentially allow an attacker to exploit this flaw, leading to system instability or unauthorized access to sensitive data.
How To Fix
Minimum fixed version
6.11.4-1
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 limit the use of the affected functionality or apply network filtering rules to mitigate the risk of malicious packet injection until the package is updated.
Conclusion
The identified vulnerability in the Linux kernel's virtio_net_hdr_to_skb function poses significant risks to system stability and security. It is crucial for users to update their systems to the patched version to mitigate these risks. Utilizing tools like Vulert can further enhance security by monitoring for vulnerabilities in real-time.
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FAQ
The vulnerability can lead to system instability and potential unauthorized access to sensitive data if exploited.
You can use tools like Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected.
Yes, a patch is available in version 6.11.4-1 of the Linux package. It is recommended to update to this version or later.
If immediate updates are not possible, consider implementing network filtering rules to limit exposure to the vulnerability.
Detailed information can be found in the official Debian CVE database or by reviewing the Linux kernel changelogs.
References
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