CVE-2026-68368
Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb() When unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length against frame_max but does not verify that the datagram fits within the declared block length. Additionally, when decoding multiple NTBs from a single socket buffer, subsequent block lengths are not checked against the actual remaining buffer data. With these checks missing, a malicious USB host can specify datagram offsets and lengths that point beyond the block, or supply secondary NTB headers declaring lengths larger than the buffer. skb_put_data() then copies adjacent kernel memory from skb_shared_info into the network skb. Fix this by verifying that sufficient buffer space remains for the NTB header before parsing, handling zero-length block declarations, ensuring that block lengths never exceed the remaining buffer space, and verifying that each datagram payload stays strictly within the block boundary.
How to fix
- Linux Linux35d15bbaec0557330e774ec31412ef508de6e0e0, 6b2be489eaa6293e60549005d91f15ceb150510f, f87ed889f0f7417b8938c98d8833f559b755373c, e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f, fff1059d139ef798bab917990524faaf25854ca8, 40c706a0224bde194667e3378c689b542fec4b44, 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c, 1febec7e47cdcd01f43fb0211094e3010474666e, 4.10, 4.15, 4.20, 5.5, 5.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < 35d15bbaec0557330e774ec31412ef508de6e0e0, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < 6b2be489eaa6293e60549005d91f15ceb150510f, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < f87ed889f0f7417b8938c98d8833f559b755373c, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < fff1059d139ef798bab917990524faaf25854ca8, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < 40c706a0224bde194667e3378c689b542fec4b44, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c, 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 ≤ v < 1febec7e47cdcd01f43fb0211094e3010474666e, f7e0611e207d8908c4f2858e244370529a76dbf7, b88ad6e714284b33a47834f5f2a294c2b37c66aa, 471b23586387a32857778c511be60ab31c98dcfd, 4f529c4d1e436230d3af7c09a3239677a14d2b46, ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8, 5bdf93a2f5459f944b416b188178ca4a92fd206f, ff3ba016263ee93a1c6209bf5ab1599de7ab1512, e7ca00f35d8a17af1ae19d529193ebc21bfda164, 4.9.235 ≤ v < 4.10, 4.14.196 ≤ v < 4.15, 4.19.143 ≤ v < 4.20, 5.4.62 ≤ v < 5.5, 5.8.6 ≤ v < 5.9, 4.14.328 ≤ v < 4.15, 4.19.297 ≤ v < 4.20, 5.4.259 ≤ v < 5.5, 5.9 | 35d15bbaec0557330e774ec31412ef508de6e0e0, 6b2be489eaa6293e60549005d91f15ceb150510f, f87ed889f0f7417b8938c98d8833f559b755373c, e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f, fff1059d139ef798bab917990524faaf25854ca8, 40c706a0224bde194667e3378c689b542fec4b44, 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c, 1febec7e47cdcd01f43fb0211094e3010474666e, 4.10, 4.15, 4.20, 5.5, 5.9 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.