CVE-2026-43427
HIGH severity · CVSS 7.1 · Out-of-bounds read
7.1CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387bPatch
- https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934Patch
- https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0Patch
- https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91Patch
- https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862aPatch
- https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173Patch
- https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360Patch
- https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5feaPatch