Infinite Loop Vulnerability in Linux Kernel's TCP BPF Receive Message Parser
Summary
CVE-2023-53133: In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() When the buffer length of the recvmsg system call is 0, we got the fl... 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 the core component of many operating systems, managing hardware resources and providing essential services to software applications. It supports various functionalities, including networking, file management, and process control. The kernel's robustness is critical for system stability and performance. However, vulnerabilities can arise, such as the one identified in the TCP BPF receive message parser, which can lead to significant performance issues.
Vulnerability Detail
The vulnerability, identified as CVE-2023-53133, occurs in the Linux kernel's tcp_bpf_recvmsg_parser function. When the buffer length of the recvmsg system call is set to 0, the function enters an infinite loop, causing a soft lockup. This results in the CPU being stuck and unable to process other tasks, leading to potential system instability and degraded performance. The issue arises from the logic that fails to return a value when no bytes are copied, causing the function to repeatedly wait for data that will never arrive.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it becomes available to mitigate the risk.
Conclusion
The CVE-2023-53133 vulnerability in the Linux kernel's tcp_bpf_recvmsg_parser function poses a significant risk by causing an infinite loop when the buffer length is zero. Users are advised to update their systems to the latest patched versions to ensure stability and performance.
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FAQ
CVE-2023-53133 is a vulnerability in the Linux kernel that causes an infinite loop in the tcp_bpf_recvmsg_parser function when the buffer length is set to 0.
The vulnerability can lead to a soft lockup, causing the CPU to become unresponsive and potentially degrading system performance.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
Yes, a patch is available in the fixed versions of the Linux kernel, specifically 6.1.20-1 for Debian 12 and 13.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to mitigate the risk associated with this vulnerability.
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