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Unrated severityNVD Advisory· Published Jan 31, 2026· Updated Mar 25, 2026

btrfs: fix NULL dereference on root when tracing inode eviction

CVE-2025-71184

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.

Affected products

80

Patches

Vulnerability mechanics

References

4

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