CVE-2026-43427
usb: class: cdc-wdm: fix reordering issue in read code path
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.
INFO
Published Date :
May 8, 2026, 3:16 p.m.
Last Modified :
May 20, 2026, 6:29 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Linux kernel to the latest stable version.
- Apply security patches for the cdc-wdm module.
- Verify memory integrity after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43427.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43427 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43427
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43427 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43427 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.26:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:rc8:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:rc9:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.26:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.130 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.203 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.167 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.78 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.26.1 up to (excluding) 5.10.253 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.9 Added Reference Type kernel.org: https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b Added Reference https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934 Added Reference https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0 Added Reference https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91 Added Reference https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a Added Reference https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173 Added Reference https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360 Added Reference https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea