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.

CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-362 CWE-362

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.5 — 5.10.252
linux	linux_kernel	5.11 — 5.15.202
linux	linux_kernel	5.16 — 6.1.165
linux	linux_kernel	6.2 — 6.6.128
linux	linux_kernel	6.7 — 6.12.75
linux	linux_kernel	6.13 — 6.18.16
linux	linux_kernel	6.19 — 6.19.6

References

Advisories & Patches

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 https://git.kernel.org/stable/c/d3af62411e19752c663fe4f424dbf49d95a4cc7c https://git.kernel.org/stable/c/d92b8fac294b5f915c50e65ce4ae2262e53614ec https://git.kernel.org/stable/c/ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8

Frequently Asked Questions

What is CVE-2026-43163? +

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. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-43163? +

CVE-2026-43163 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43163? +

CVE-2026-43163 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43163? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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