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Vulnerability DatabaseCVE-2025-21925
CVE-2025-21925:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-21925 is a vulnerability discovered in the Linux kernel affecting the LLC (Logical Link Control) networking component. The vulnerability was disclosed on April 1, 2025, and involves improper handling of socket buffer (skb) sharing in the LLC implementation (NVD).
Technical details
The vulnerability stems from incorrect usage of skbget() before devqueuexmit() in the LLC networking stack. The issue specifically affects devices not supporting IFFTXSKBSHARING, where the e1000 driver calls ethskbpad() while the skb is shared. The technical solution involves replacing skbget() with skbclone() in net/llc/llcsac.c (NVD).
Impact
When exploited, this vulnerability can lead to kernel crashes, as demonstrated by syzbot testing. The issue manifests as a kernel BUG at net/core/skbuff.c:2178, resulting in system instability (NVD).
Mitigation and workarounds
The vulnerability has been addressed in Linux kernel version 6.1.133-1 as part of a security update. The fix involves replacing skbget() with skbclone() in the LLC networking code (Debian Security).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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