Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2021-47539
CVE-2021-47539:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2021-47539 affects the Linux kernel's rxrpc subsystem. The vulnerability was discovered in the rxrpclookupbundle() function where a memory leak occurs due to improper handling of rxrpcpeer references. The issue was disclosed on May 24, 2024, and affects the Linux kernel's networking stack (Kernel Git).
Technical details
The vulnerability stems from a failure to properly release rxrpcpeer references in the rxrpclookupbundle() function. Specifically, the code needed to call rxrpcputpeer() for bundle candidates before kfree() as it holds a reference to rxrpc_peer. This issue was introduced in commit 245500d853e9 which rewrote the client connection manager (Kernel Git).
Impact
The vulnerability results in a memory leak in the Linux kernel's rxrpc subsystem, which could potentially lead to resource exhaustion over time (NVD).
Mitigation and workarounds
The issue has been fixed by abstracting out the bundle freeing code into a function and ensuring proper cleanup of rxrpc_peer references. The fix was implemented through patches in the Linux kernel that properly handle the deallocation of resources (Kernel Git).
Additional resources
Source: This report was generated using AI
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