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CVE-2024-40972 is a Linux kernel ext4 locking flaw in extended-attribute handling. The ext4_xattr_set_entry() path could create a new extended-attribute (EA) inode while holding the buffer lock for an external xattr block. EA-inode creation performs allocation operations that can acquire locks on other buffers, resulting in unsafe lock nesting beneath the existing buffer lock. On a corrupted filesystem, including a condition in which a quota file references an xattr block as a data block, this lock ordering can deadlock. The upstream fix relocates EA-inode allocation from ext4_xattr_set_entry() to its callers, before the relevant buffer lock is held.
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Linux kernel ext4 extended-attribute inode creation issue involving a buffer lock.
Linux kernel ext4 extended-attribute inode creation under a buffer lock vulnerability.
A Linux kernel ext4 filesystem vulnerability in which creation of extended-attribute (EA) inodes occurred while holding an external xattr-buffer lock. Nested allocation locking under that lock can cause a deadlock, including in filesystem-corruption scenarios involving a quota file containing an xattr block as a data block.
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Cross-references every affected SKU, including bundled OEM variants.
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