Vulnerability-Lookup

FKIE_CVE-2026-68368

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20

Severity

Summary

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35d15bbaec0557330e774ec31412ef508de6e0e0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/40c706a0224bde194667e3378c689b542fec4b44
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b2be489eaa6293e60549005d91f15ceb150510f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f87ed889f0f7417b8938c98d8833f559b755373c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fff1059d139ef798bab917990524faaf25854ca8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "35d15bbaec0557330e774ec31412ef508de6e0e0",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "6b2be489eaa6293e60549005d91f15ceb150510f",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "f87ed889f0f7417b8938c98d8833f559b755373c",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "fff1059d139ef798bab917990524faaf25854ca8",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "40c706a0224bde194667e3378c689b542fec4b44",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "1febec7e47cdcd01f43fb0211094e3010474666e",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f7e0611e207d8908c4f2858e244370529a76dbf7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88ad6e714284b33a47834f5f2a294c2b37c66aa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "471b23586387a32857778c511be60ab31c98dcfd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f529c4d1e436230d3af7c09a3239677a14d2b46",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5bdf93a2f5459f944b416b188178ca4a92fd206f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ff3ba016263ee93a1c6209bf5ab1599de7ab1512",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e7ca00f35d8a17af1ae19d529193ebc21bfda164",
              "versionType": "git"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.235",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.196",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.143",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.62",
              "versionType": "semver"
            },
            {
              "lessThan": "5.9",
              "status": "affected",
              "version": "5.8.6",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.328",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.297",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.259",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()\n\nWhen unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length\nagainst frame_max but does not verify that the datagram fits within the\ndeclared block length. Additionally, when decoding multiple NTBs from a\nsingle socket buffer, subsequent block lengths are not checked against the\nactual remaining buffer data.\n\nWith these checks missing, a malicious USB host can specify datagram\noffsets and lengths that point beyond the block, or supply secondary NTB\nheaders declaring lengths larger than the buffer. skb_put_data() then\ncopies adjacent kernel memory from skb_shared_info into the network skb.\n\nFix this by verifying that sufficient buffer space remains for the NTB\nheader before parsing, handling zero-length block declarations, ensuring\nthat block lengths never exceed the remaining buffer space, and verifying\nthat each datagram payload stays strictly within the block boundary."
    }
  ],
  "id": "CVE-2026-68368",
  "lastModified": "2026-08-19T17:20:46.323",
  "metrics": {},
  "published": "2026-08-10T13:20:29.503",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/35d15bbaec0557330e774ec31412ef508de6e0e0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/40c706a0224bde194667e3378c689b542fec4b44"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b2be489eaa6293e60549005d91f15ceb150510f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f87ed889f0f7417b8938c98d8833f559b755373c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fff1059d139ef798bab917990524faaf25854ca8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-68368 (GCVE-0-2026-68368)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34

Title

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

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/35d15bbaec0557330…
https://git.kernel.org/stable/c/6b2be489eaa6293e6…
https://git.kernel.org/stable/c/f87ed889f0f7417b8…
https://git.kernel.org/stable/c/e07751d0527ccc2a1…
https://git.kernel.org/stable/c/fff1059d139ef798b…
https://git.kernel.org/stable/c/40c706a0224bde194…
https://git.kernel.org/stable/c/41fd5f2fb0027d377…
https://git.kernel.org/stable/c/1febec7e47cdcd01f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < 35d15bbaec0557330e774ec31412ef508de6e0e0 (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < 6b2be489eaa6293e60549005d91f15ceb150510f (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < f87ed889f0f7417b8938c98d8833f559b755373c (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < fff1059d139ef798bab917990524faaf25854ca8 (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < 40c706a0224bde194667e3378c689b542fec4b44 (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c (git) Affected: 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 , < 1febec7e47cdcd01f43fb0211094e3010474666e (git) Affected: f7e0611e207d8908c4f2858e244370529a76dbf7 (git) Affected: b88ad6e714284b33a47834f5f2a294c2b37c66aa (git) Affected: 471b23586387a32857778c511be60ab31c98dcfd (git) Affected: 4f529c4d1e436230d3af7c09a3239677a14d2b46 (git) Affected: ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8 (git) Affected: 5bdf93a2f5459f944b416b188178ca4a92fd206f (git) Affected: ff3ba016263ee93a1c6209bf5ab1599de7ab1512 (git) Affected: e7ca00f35d8a17af1ae19d529193ebc21bfda164 (git) Affected: 4.9.235 , < 4.10 (semver) Affected: 4.14.196 , < 4.15 (semver) Affected: 4.19.143 , < 4.20 (semver) Affected: 5.4.62 , < 5.5 (semver) Affected: 5.8.6 , < 5.9 (semver) Affected: 4.14.328 , < 4.15 (semver) Affected: 4.19.297 , < 4.20 (semver) Affected: 5.4.259 , < 5.5 (semver)
Linux	Linux	Affected: 5.9 Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "35d15bbaec0557330e774ec31412ef508de6e0e0",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "6b2be489eaa6293e60549005d91f15ceb150510f",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "f87ed889f0f7417b8938c98d8833f559b755373c",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "fff1059d139ef798bab917990524faaf25854ca8",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "40c706a0224bde194667e3378c689b542fec4b44",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "lessThan": "1febec7e47cdcd01f43fb0211094e3010474666e",
              "status": "affected",
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f7e0611e207d8908c4f2858e244370529a76dbf7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88ad6e714284b33a47834f5f2a294c2b37c66aa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "471b23586387a32857778c511be60ab31c98dcfd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f529c4d1e436230d3af7c09a3239677a14d2b46",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5bdf93a2f5459f944b416b188178ca4a92fd206f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ff3ba016263ee93a1c6209bf5ab1599de7ab1512",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e7ca00f35d8a17af1ae19d529193ebc21bfda164",
              "versionType": "git"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.235",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.196",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.143",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.62",
              "versionType": "semver"
            },
            {
              "lessThan": "5.9",
              "status": "affected",
              "version": "5.8.6",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.328",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.297",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.259",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.9.235",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.196",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.143",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.62",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.8.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.328",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.297",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.259",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()\n\nWhen unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length\nagainst frame_max but does not verify that the datagram fits within the\ndeclared block length. Additionally, when decoding multiple NTBs from a\nsingle socket buffer, subsequent block lengths are not checked against the\nactual remaining buffer data.\n\nWith these checks missing, a malicious USB host can specify datagram\noffsets and lengths that point beyond the block, or supply secondary NTB\nheaders declaring lengths larger than the buffer. skb_put_data() then\ncopies adjacent kernel memory from skb_shared_info into the network skb.\n\nFix this by verifying that sufficient buffer space remains for the NTB\nheader before parsing, handling zero-length block declarations, ensuring\nthat block lengths never exceed the remaining buffer space, and verifying\nthat each datagram payload stays strictly within the block boundary."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:34:26.235Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/35d15bbaec0557330e774ec31412ef508de6e0e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b2be489eaa6293e60549005d91f15ceb150510f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f87ed889f0f7417b8938c98d8833f559b755373c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f"
        },
        {
          "url": "https://git.kernel.org/stable/c/fff1059d139ef798bab917990524faaf25854ca8"
        },
        {
          "url": "https://git.kernel.org/stable/c/40c706a0224bde194667e3378c689b542fec4b44"
        },
        {
          "url": "https://git.kernel.org/stable/c/41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e"
        }
      ],
      "title": "usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68368",
    "datePublished": "2026-08-10T12:03:45.579Z",
    "dateReserved": "2026-07-30T09:28:09.386Z",
    "dateUpdated": "2026-08-19T16:34:26.235Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-68368

CVE-2026-68368 (GCVE-0-2026-68368)

Tags

Sightings

Nomenclature