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Vulnerability DatabaseCVE-2022-49871
CVE-2022-49871:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49871 is a memory leak vulnerability discovered in the Linux kernel's network TUN (tunnel) device driver. The vulnerability was disclosed on May 1, 2025, affecting multiple versions of the Linux kernel from version 4.15 up to version 6.1 RC4 (NVD).
Technical details
The vulnerability occurs in the tun_get_user() function where napi_gro_frags() is called. The issue manifests when napi->rx_count is less than gro_normal_batch, causing gro_normal_list() not to be called. This results in napi->rx_list remaining non-empty, which leads to memory leaks during tun_napi_del() execution. The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD, Wiz).
Impact
The memory leak vulnerability can lead to resource exhaustion over time as memory is not properly freed, potentially affecting system stability and performance (NVD).
Mitigation and workarounds
The vulnerability has been fixed by adding napi_complete() after napi_gro_frags() to ensure proper cleanup of resources. This patch has been incorporated into the Linux kernel (NVD).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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