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CVE-2026-43163 is a use-after-free race condition in the Linux kernel md bitmap subsystem during array resizing. bitmap_daemon_work() iterates over bitmap->storage.filemap without locking while __bitmap_resize() frees the same storage through md_bitmap_file_unmap(). Because quiesce() does not stop the md thread, the daemon can access freed pages, triggering a General Protection Fault in write_page() and potentially crashing the system. The fix holds mddev->bitmap_info.mutex during bitmap updates to synchronize access.
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A Linux kernel MD bitmap use-after-free race during array resizing can cause a General Protection Fault in write_page(). The bitmap daemon accesses storage concurrently freed by the resize path. The fix holds mddev->bitmap_info.mutex during bitmap updates. The listed CVSS v3 score is 4.7, reflecting local access, high attack complexity, low privileges, and high availability impact.
Linux kernel vulnerability referenced by the advisory.
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.
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Cross-references every affected SKU, including bundled OEM variants.
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