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High severity7.1NVD Advisory· Published May 8, 2026· Updated May 20, 2026

CVE-2026-43427

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

16
  • Linux/Kernel16 versions
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 15 more
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.26.1,<5.10.253
    • cpe:2.3:o:linux:linux_kernel:2.6.26:-:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc4:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc5:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc6:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc7:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc8:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:2.6.26:rc9:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
    • (no CPE)

Patches

Vulnerability mechanics

References

8

News mentions

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