Answer in brief
CVE-2026-23448 records a High severity (CVSS 7.8) vulnerability in net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <63c35b8fce77a7892e8fa06c540d4943145506eb || >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <f1c7701d3ac91b62d672c13690cf295821f0d5c3 || >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <789204f980730258c983102c027c375238009c80 || >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <403f94ddcb36c552fbef51dea735b131e3dcde8b || >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <dce9dda0e3707e887977db44407989e9ead26611 || >=ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 <2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a | 63c35b8fce77a7892e8fa06c540d4943145506eb, f1c7701d3ac91b62d672c13690cf295821f0d5c3, 789204f980730258c983102c027c375238009c80, 403f94ddcb36c552fbef51dea735b131e3dcde8b, dce9dda0e3707e887977db44407989e9ead26611, 2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a |
| Linux/Linuxgeneric | 3.8 | Not reported |
Published upstream
Apr 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.