Bug 2383423 (CVE-2025-38382)

Summary: CVE-2025-38382 kernel: btrfs: fix iteration of extrefs during log replay
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-07-25 14:03:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix iteration of extrefs during log replay

At __inode_add_ref() when processing extrefs, if we jump into the next
label we have an undefined value of victim_name.len, since we haven't
initialized it before we did the goto. This results in an invalid memory
access in the next iteration of the loop since victim_name.len was not
initialized to the length of the name of the current extref.

Fix this by initializing victim_name.len with the current extref's name
length.
Comment 1 Jon Moroney 2025-07-25 18:46:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072505-CVE-2025-38382-c4f2@gregkh/T