CVE-2026-43427

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.

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