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CVE-2024-40998 is an initialization-order vulnerability in the Linux kernel ext4 filesystem's __ext4_fill_super() function. The filesystem registers its sysfs interface before initializing the message rate-limiting state's lock. During this window, another process can change the rate-limit interval from zero to a nonzero value. A subsequent ext4_msg() call, including during ext4_orphan_cleanup(), then causes ___ratelimit() to access the uninitialized lock. The demonstrated execution triggers a lockdep warning and disables the kernel's locking correctness validator.
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An initialization-order race in the Linux kernel's ext4 filesystem exposes sysfs controls before the message rate-limit lock is initialized. Concurrent modification of the rate-limit interval during filesystem mounting can cause access to an uninitialized lock and disable the locking correctness validator. The advisory rates the vulnerability Medium, with CVSS v3 5.5 and high availability impact requiring local access and low privileges. The fix registers sysfs only after initialization is complete.
Linux kernel ext4 uninitialized ratelimit_state lock access in __ext4_fill_super().
Linux kernel ext4 filesystem vulnerability caused by access to an uninitialized ratelimit_state lock during filesystem superblock initialization.
An uninitialized ratelimit_state lock access vulnerability in the Linux kernel ext4 filesystem superblock initialization path.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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