usb: legacy: ncm: Fix NPE in gncm_bind

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Summary

CVECVE-2026-43422
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:54 UTC
Updated2026-05-12 14:10:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: legacy: ncm: Fix NPE in gncm_bind Commit 56a512a9b410 ("usb: gadget: f_ncm: align net_device lifecycle with bind/unbind") deferred the allocation of the net_device. This change leads to a NULL pointer dereference in the legacy NCM driver as it attempts to access the net_device before it's fully instantiated. Store the provided qmult, host_addr, and dev_addr into the struct ncm_opts->net_opts during gncm_bind(). These values will be properly applied to the net_device when it is allocated and configured later in the binding process by the NCM function driver.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.041320000 (date 2026-05-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b62076e780a2121903ecf9ffdfb89c64647cb7da be5738d19bed244ede84da45bc45395bcb1d99e0 git Not specified
CNA Linux Linux affected 188338c1827842f898761a939669cf345bdf07e2 b23e86a3a15803c3dcb24701285f73e65099fdf9 git Not specified
CNA Linux Linux affected 56a512a9b4107079f68701e7d55da8507eb963d9 fde0634ad9856b3943a2d1a8cc8de174a63ac840 git Not specified
CNA Linux Linux affected 6.18.17 6.18.19 semver Not specified
CNA Linux Linux affected 6.19.7 6.19.9 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fde0634ad9856b3943a2d1a8cc8de174a63ac840 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be5738d19bed244ede84da45bc45395bcb1d99e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b23e86a3a15803c3dcb24701285f73e65099fdf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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