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A vulnerability in the Linux kernel's Btrfs filesystem was fixed to address a NULL pointer dereference during inode eviction tracing. The issue occurs because the root pointer may be NULL when setting up tracing, which can lead to a NULL dereference. The fix involves setting the root object ID to 0 when the root is NULL to allow safe tracing. This vulnerability has a medium severity score and affects certain Linux kernel versions prior to 6.8.0-1055.56 and related versions. A patch is available and included in recent Ubuntu kernel updates.

The Linux kernel Btrfs filesystem had a vulnerability (CVE-2025-71184) where a NULL pointer dereference could occur during inode eviction tracing. Specifically, in the btrfs_evict_inode() function, tracing setup attempts to fetch the root's ID before confirming the root pointer is non-NULL, leading to a potential NULL dereference. The remediation sets the root_objectid to 0 if the root is NULL, enabling safe tracing even in this case. This issue was resolved in Linux kernel versions 6.8.0-1055.56 and later. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity) with local attack vector, low complexity, low privileges required, no user interaction, and impacts availability only. The fix is included in Ubuntu security notices USN-8278-1 and USN-8289-1, which provide updated kernel packages for various Ubuntu releases and platforms.

Detailed information about UBUNTU-CVE-2025-71184 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2025-71184 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix NULL dereference on root when tracing inode eviction When evicting an… (CVE-2025-71184)

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