Description
In 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.
Product status
ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 (git) before f1c7701d3ac91b62d672c13690cf295821f0d5c3
ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 (git) before 789204f980730258c983102c027c375238009c80
ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 (git) before 403f94ddcb36c552fbef51dea735b131e3dcde8b
ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 (git) before dce9dda0e3707e887977db44407989e9ead26611
ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 (git) before 2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a
3.8
Any version before 3.8
6.6.130 (semver)
6.12.78 (semver)
6.18.20 (semver)
6.19.10 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/f1c7701d3ac91b62d672c13690cf295821f0d5c3
git.kernel.org/...c/789204f980730258c983102c027c375238009c80
git.kernel.org/...c/403f94ddcb36c552fbef51dea735b131e3dcde8b
git.kernel.org/...c/dce9dda0e3707e887977db44407989e9ead26611
git.kernel.org/...c/2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a