4.7

CVE-2026-43163

md/bitmap: fix GPF in write_page caused by resize race

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.5 < 5.10.252
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.202
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.165
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.128
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.75
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.16
Linux ≫ Linux Kernel Version >= 6.19 < 6.19.6
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.01% 0.017
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.