CVE-2026-43427
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
Product
Linux Kernel
PublishedMay 8, 2026
First seenMay 8, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- linux linux_kernel5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9 or later
Patches
- git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b
- git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934
- git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0
- git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91
- git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a
- git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173
- git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360
- git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.26.1 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.167, 6.2 ≤ v < 6.6.130, 6.7 ≤ v < 6.12.78, 6.13 ≤ v < 6.18.19, 6.19 ≤ v < 6.19.9, 2.6.26, 7.0 | 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9 |
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