CVE-2026-43427
Published: May 9, 2026Last modified: May 9, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.1 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.167-r0) |
| 25 LTS | linux-lts | Fixed (6.12.80-r0) | |
| Stream | linux-lts | Fixed (6.12.80-r0) |
References
- https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b
- https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934
- https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0
- https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91
- https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a
- https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173
- https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360
- https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea