Double Uncharge Memory Vulnerability in Kernel
Summary
GSD-2022-1002077: bpf, sockmap: Fix double uncharge the mem of sk_msg. Affects Kernel versions >= 604326b41a6fb9b4a78b6179335decee0365cd8c, < cd84ea3920aef936c559b63099ef0013ce6b2325. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's bpf and sockmap modules, which are responsible for handling network socket operations and implementing Berkeley Packet Filter (BPF) programs. These modules allow users to create and manage socket maps, which can be used for various network-related tasks.
Vulnerability Detail
The double uncharge memory vulnerability in the bpf and sockmap modules of the Kernel allows an attacker to exploit a flaw in the handling of sk_msg objects. This vulnerability can be triggered by a specially crafted network packet, leading to a double free of memory. If successfully exploited, an attacker could potentially execute arbitrary code or cause a denial-of-service (DoS) condition. The vulnerability was introduced in version 4.20 of the Kernel and has been fixed in version 5.10.110.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch provided in the fix commit (cd84ea3920aef936c559b63099ef0013ce6b2325) manually. The patch modifies the affected code to prevent the double uncharge of sk_msg memory. Here is an example of the modified code:
// Original code
...
free_sk_msg(msg);
...
// Patched code
...
if (msg->sk)
free_sk_msg(msg);
...
Conclusion
The double uncharge memory vulnerability in the bpf and sockmap modules of the Kernel can pose a significant security risk if left unpatched. It is crucial to update the Linux Kernel to version 5.10.110 or later to mitigate this vulnerability. Regularly updating the Kernel and staying informed about the latest security patches is essential for maintaining a secure system. For further support or assistance with vulnerability remediation, you can reach out to DevNack.com.
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FAQ
If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition on a system running the affected version of the Kernel.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
There are no known instances of this vulnerability being exploited in the wild at the time of this report. However, it is important to apply the necessary updates and patches to mitigate the risk.
Yes, this vulnerability can be exploited remotely by sending a specially crafted network packet to a system running the affected version of the Kernel.
For more details about this vulnerability, including the technical aspects and the fix commit, you can refer to the vulnerability report in the GSD database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2022/1002xxx/GSD-2022-1002077.json).
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