net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check

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Summary

CVECVE-2026-23448
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 16:16:30 UTC
Updated2026-04-03 16:16:30 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check cdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE entries fit within the skb. The first check correctly accounts for ndpoffset: if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) but the second check omits it: if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) This validates the DPE array size against the total skb length as if the NDP were at offset 0, rather than at ndpoffset. When the NDP is placed near the end of the NTB (large wNdpIndex), the DPE entries can extend past the skb data buffer even though the check passes. cdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating the DPE array. Add ndpoffset to the nframes bounds check and use struct_size_t() to express the NDP-plus-DPE-array size more clearly.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.046090000 (date 2026-04-04)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 f1c7701d3ac91b62d672c13690cf295821f0d5c3 git Not specified
CNA Linux Linux affected ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 789204f980730258c983102c027c375238009c80 git Not specified
CNA Linux Linux affected ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 403f94ddcb36c552fbef51dea735b131e3dcde8b git Not specified
CNA Linux Linux affected ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 dce9dda0e3707e887977db44407989e9ead26611 git Not specified
CNA Linux Linux affected ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/403f94ddcb36c552fbef51dea735b131e3dcde8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/789204f980730258c983102c027c375238009c80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dce9dda0e3707e887977db44407989e9ead26611 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1c7701d3ac91b62d672c13690cf295821f0d5c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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