CVE-2026-43163

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < 140cc839fbeb1ddb33a8da8811b716d88d3905b7affected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8affected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < d3af62411e19752c663fe4f424dbf49d95a4cc7caffected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < d92b8fac294b5f915c50e65ce4ae2262e53614ecaffected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < a437e3bf30e32846079e470c1ba5ee790bccdf89affected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < 9a6f8cd28bb9bb6ed86a6df19331fb08016dee7faffected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < 5f73c8b33df9a605a591eab72d43a969600c1f8caffected
LinuxLinuxd60b479d177a5735b6b4db6ee5280ef6653f50e7 < 46ef85f854dfa9d5226b3c1c46493d79556c9589affected
LinuxLinux3.5affected
LinuxLinux0 < 3.5unaffected
LinuxLinux5.10.252 <= 5.10.*unaffected
LinuxLinux5.15.202 <= 5.15.*unaffected
LinuxLinux6.1.165 <= 6.1.*unaffected
LinuxLinux6.6.128 <= 6.6.*unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.16 <= 6.18.*unaffected
LinuxLinux6.19.6 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References