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Vulnerability record · CVE-2026-43427 · published 8 May 2026

CVE-2026-43427: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.

7.1 CVSS 3.1 High EPSS 0.18% · top 93.7% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b Patch
https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934 Patch
https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0 Patch
https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91 Patch
https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a Patch
https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173 Patch
https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360 Patch
https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43427), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.