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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68368

usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < 35d15bbaec0557330e774ec31412ef508de6e0e0affected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < 6b2be489eaa6293e60549005d91f15ceb150510faffected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < f87ed889f0f7417b8938c98d8833f559b755373caffected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381faffected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < fff1059d139ef798bab917990524faaf25854ca8affected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < 40c706a0224bde194667e3378c689b542fec4b44affected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5caffected
  • 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 to < 1febec7e47cdcd01f43fb0211094e3010474666eaffected
  • f7e0611e207d8908c4f2858e244370529a76dbf7affected
  • b88ad6e714284b33a47834f5f2a294c2b37c66aaaffected
  • 471b23586387a32857778c511be60ab31c98dcfdaffected
  • 4f529c4d1e436230d3af7c09a3239677a14d2b46affected
  • ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8affected
  • 5bdf93a2f5459f944b416b188178ca4a92fd206faffected
  • ff3ba016263ee93a1c6209bf5ab1599de7ab1512affected
  • e7ca00f35d8a17af1ae19d529193ebc21bfda164affected
  • 4.9.235 to < 4.10affected
  • 4.14.196 to < 4.15affected
  • 4.19.143 to < 4.20affected
  • 5.4.62 to < 5.5affected
  • 5.8.6 to < 5.9affected
  • 4.14.328 to < 4.15affected
  • 4.19.297 to < 4.20affected
  • 5.4.259 to < 5.5affected

Linux Linux

Default version status: affected

  • 5.9affected
  • 0 to < 5.9unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References