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CVE-2024-40972 is a locking flaw in the Linux kernel's ext4 filesystem implementation. The ext4_xattr_set_entry() function creates extended-attribute (EA) inodes while holding the external xattr block's buffer lock, nesting allocation-related locking, including acquisition of other buffer locks, beneath that lock. This can cause a deadlock on a corrupted filesystem, for example when a quota file contains an xattr block as a data block. The fix moves EA inode allocation into the function's callers so that allocation occurs outside the buffer lock.
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A Linux kernel ext4 locking vulnerability in which creating extended-attribute (EA) inodes while holding an external xattr block buffer lock can cause deadlock, including under certain filesystem-corruption conditions. The fix moves EA inode allocation into the callers. The reference assigns a medium CVSS v3 score of 5.5, with local access, low privileges, and high availability impact.
Linux kernel ext4 flaw involving extended-attribute inode creation under a buffer lock.
A Linux kernel ext4 filesystem flaw in which creating extended-attribute (EA) inodes while holding an external xattr-block buffer lock could cause lock nesting and a potential deadlock, particularly on a corrupted filesystem.
A locally exploitable vulnerability affecting Unity Linux/UOS Server systems; successful exploitation can impact system availability. The provided CVSS v3 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
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