CVE-2026-43163

Description

In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over `bitmap->storage.filemap` without locking, while the resize path frees that storage via md_bitmap_file_unmap(). `quiesce()` does not stop the md thread, allowing concurrent access to freed pages. Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.

References

• https://git.kernel.org/stable/c/140cc839fbeb1ddb33a8da8811b716d88d3905b7
• https://git.kernel.org/stable/c/46ef85f854dfa9d5226b3c1c46493d79556c9589
• https://git.kernel.org/stable/c/5f73c8b33df9a605a591eab72d43a969600c1f8c
• https://git.kernel.org/stable/c/9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f
• https://git.kernel.org/stable/c/a437e3bf30e32846079e470c1ba5ee790bccdf89