In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in...

CVE-2026-43163 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

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.

Basic information

Type
unreviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Not specified
Published (advisory)
2026-05-06 12:30:31 UTC
Updated
2026-05-13 21:33:04 UTC
NVD published
2026-05-06

EPSS Score

Score Percentile
0.01% 1.73%

CVSS Scores

Base score Version Severity Vector
4.7 3.1 —
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-4hfr-m4m2-94ff ↗
CVE CVE-2026-43163 ↗

CWEs

CWE id Name
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

References

cvelogic Threat Intelligence