Bug 2422670 (CVE-2025-40361)

Summary: CVE-2025-40361 kernel: Linux kernel: ext4 deadlock vulnerability (CVE Rejected)
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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A flaw was found in the Linux kernel's ext4 filesystem component. A local user could potentially trigger a deadlock due to inconsistent memory allocation flags in the `ext4_xattr_inode_cache_find` function, which could lead to a Denial of Service (DoS). However, this CVE has been rejected by the assigning CNA.
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Description OSIDB Bzimport 2025-12-16 14:02:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs: ext4: change GFP_KERNEL to GFP_NOFS to avoid deadlock

The parent function ext4_xattr_inode_lookup_create already uses GFP_NOFS for memory alloction, so the function ext4_xattr_inode_cache_find should use same gfp_flag.
Comment 1 Alexander B 2025-12-17 04:22:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121644-CVE-2025-40361-50ca@gregkh/T