CVE-2026-90277
UnknownSummary
In the Linux kernel, the md/md-llbitmap subsystem's llbitmap_create() publishes mddev->bitmap before reading the bitmap superblock. If llbitmap_read_sb() fails, the old cleanup freed llbitmap before clearing mddev->bitmap, so readers such as /proc/mdstat could observe a stale pointer. The fix clears mddev->bitmap while holding bitmap_info.mutex.
Risk Assessment
Can lead to use-after-free and kernel instability during a failed bitmap creation. May result in system crashes or incorrect array statistics reads.
Recommendation
Update the Linux kernel to a version containing the fix that clears mddev->bitmap under the mutex. The update is especially recommended on systems heavily using md arrays and llbitmap.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: md/md-llbitmap: prevent create failure bitmap UAF llbitmap_create() publishes mddev->bitmap before reading the bitmap superblock. This is needed because llbitmap_read_sb() can initialize a new bitmap and flush it through helpers that use mddev->bitmap. If llbitmap_read_sb() fails, the old cleanup dropped bitmap_info.mutex and freed llbitmap before clearing mddev->bitmap. Readers such as /proc/mdstat rely on bitmap_info.mutex to keep the bitmap pointer stable while collecting bitmap stats, so they could observe the stale pointer after the failed create path released the mutex. Clear mddev->bitmap while still holding bitmap_info.mutex, then free the failed llbitmap after dropping the mutex. This makes mutex-protected readers see either a live bitmap or no bitmap.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS