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CVE-2026-43163 is a Linux kernel vulnerability in the md/bitmap subsystem caused by a use-after-free race during array resize operations. The flaw occurs when bitmap_daemon_work() and __bitmap_resize() execute concurrently: the bitmap daemon iterates over bitmap->storage.filemap without holding the necessary lock, while the resize path can free the same backing storage through md_bitmap_file_unmap(). Because quiesce() does not stop the md thread in this path, write_page() can dereference pages that have already been freed, leading to a General Protection Fault. The issue was fixed by holding mddev->bitmap_info.mutex during the bitmap update to serialize access to the bitmap storage.
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A Linux kernel vulnerability in md/bitmap that can trigger a general protection fault in write_page due to a resize race.
A Linux kernel md/bitmap race condition vulnerability that can trigger a general protection fault in write_page during resize operations.
A Linux kernel vulnerability in md/bitmap where a resize race can cause a general protection fault in write_page.
A use-after-free race condition in the Linux kernel md/bitmap component during array resize operations that can trigger a General Protection Fault and cause denial of service.
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