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CVE-2024-40998 is an initialization-order race in the Linux kernel ext4 filesystem mount path, specifically __ext4_fill_super(). ext4 registered its sysfs controls before initializing the filesystem message ratelimit state and its embedded spinlock. Before initialization, the ratelimit interval is ordinarily zero and the ratelimit path returns without acquiring the lock. A concurrent local process can set the exposed message-ratelimit interval to a non-zero value during this window; a subsequent ext4 diagnostic message, including during orphan cleanup, then invokes the ratelimit logic and attempts to acquire the uninitialized lock. The fix defers sysfs registration until ext4 initialization is complete.
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No public exploit code observed for this vulnerability.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
Linux kernel ext4 flaw involving access to an uninitialized ratelimit_state lock during filesystem superblock initialization.
Linux kernel ext4 uninitialized ratelimit_state lock access in __ext4_fill_super().
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.