CVE-2026-43427
usb: class: cdc-wdm: fix reordering issue in read code path
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 8, 2026 |
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Affected Versions
Linux / Linux
afba937e540c902c989cd516fd97ea0c8499bb27 < 638328ca9c17ae6511ad62198c57bae32ffa3c91 afba937e540c902c989cd516fd97ea0c8499bb27 < 170e8daca24da6edb4be82ab01abf44e87af387b afba937e540c902c989cd516fd97ea0c8499bb27 < c8fa96ed021923dae147bcd9f9205b8df7b82360 afba937e540c902c989cd516fd97ea0c8499bb27 < 4ee3062bf2c9a722afef429826e8607eaf3fc6a0 afba937e540c902c989cd516fd97ea0c8499bb27 < 276aef0fd2b92f41b920ac891c72cadeee957934 afba937e540c902c989cd516fd97ea0c8499bb27 < 67ed312124bb1b61858778ac0b985b48961c862a afba937e540c902c989cd516fd97ea0c8499bb27 < e3c874b05901dc519054b5107d16620e6d2b5fea afba937e540c902c989cd516fd97ea0c8499bb27 < 8df672bfe3ec2268c2636584202755898e547173
Linux / Linux
2.6.26
References
git.kernel.org: https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91 git.kernel.org: https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b git.kernel.org: https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360 git.kernel.org: https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0 git.kernel.org: https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934 git.kernel.org: https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a git.kernel.org: https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea git.kernel.org: https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173