BaseFortify

Publication date: 2026-01-31

Last updated on: 2026-03-25

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix NULL dereference on root when tracing inode eviction When evicting an inode the first thing we do is to setup tracing for it, which implies fetching the root's id. But in btrfs_evict_inode() the root might be NULL, as implied in the next check that we do in btrfs_evict_inode(). Hence, we either should set the ->root_objectid to 0 in case the root is NULL, or we move tracing setup after checking that the root is not NULL. Setting the rootid to 0 at least gives us the possibility to trace this call even in the case when the root is NULL, so that's the solution taken here.

CVSS Scores

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Meta Information

Published

2026-01-31

Last Modified

2026-03-25

Generated

2026-07-06

AI Q&A

2026-01-31

EPSS Evaluated

2026-07-05

NVD

CVE-2025-71184

EUVD

EUVD-2025-206591

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	2.6.39
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	From 6.13 (inc) to 6.18.6 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.66 (exc)
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	From 2.6.39.1 (inc) to 6.6.130 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a NULL pointer dereference in the Linux kernel's btrfs filesystem code during inode eviction. Specifically, when evicting an inode, the code attempts to set up tracing by fetching the root's ID. However, the root pointer can be NULL, which leads to a NULL dereference. The fix involves either setting the root_objectid to 0 if the root is NULL or moving the tracing setup after confirming the root is not NULL, allowing safe tracing even when root is NULL.

Impact Analysis

This vulnerability can cause a NULL pointer dereference in the Linux kernel, which may lead to a kernel crash or system instability when evicting inodes in the btrfs filesystem. This could result in denial of service or unexpected system behavior.

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