Vulnerability-Lookup

CVE-2026-80731 (GCVE-0-2026-80731)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-03 08:21

Title

net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header

Summary

In the Linux kernel, the following vulnerability has been resolved: net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header dev_validate_header() reads dev->hard_header_len directly when zero-padding short link layer headers for CAP_SYS_RAWIO holders: if (capable(CAP_SYS_RAWIO)) { memset(ll_header + len, 0, dev->hard_header_len - len); return true; } Packet send paths call dev_validate_header() on skbs whose headroom was allocated from an earlier hard_header_len read. If the device is reconfigured so that dev->hard_header_len increases before validation, the memset writes past the reserved buffer, an out-of-bounds write. This out-of-bounds write is masked in some SOCK_RAW paths today because the same concurrent increase can first make skb_push() exceed the reserved headroom and trigger skb_under_panic(). Remove the zero-padding branch before making those hard_header_len reads consistent, so the snapshot fixes do not turn a loud panic into a silent overwrite. This path is only reached for variable length L2 protocols, where len < hard_header_len but len >= min_header_len. No remaining in-tree variable length L2 protocol implements header_ops->validate, and the CAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no real value beyond allowing testing of intentionally malformed input. Drop the CAP_SYS_RAWIO branch. The remaining reads of dev->hard_header_len in dev_validate_header() are comparisons only and have no memory safety impact.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/53fd7f912c0877647…
https://git.kernel.org/stable/c/fa6d98dd925e72fc0…
https://git.kernel.org/stable/c/8fc9816404166a90e…
https://git.kernel.org/stable/c/b0f92a5731dc82556…
https://git.kernel.org/stable/c/99df6b7a713f96eda…
https://git.kernel.org/stable/c/74e035f07f53feca0…
https://git.kernel.org/stable/c/dbb30dc943a93e083…
https://git.kernel.org/stable/c/fc902f52a02298c74…
https://git.kernel.org/stable/c/3b9a324e646d3657a…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: b5518429e70cd783b8ca52335456172c1a0589f6 , < 53fd7f912c0877647d6a1e1877f5ea8535ee0b4a (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6 (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < 8fc9816404166a90ed8d544dc52482fafffb6d9f (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < b0f92a5731dc82556a9ae005cc35f71ab136307b (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < 99df6b7a713f96eda206680d100b76e15f9d9b69 (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < 74e035f07f53feca09e2352e77fccb09cad5e208 (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < dbb30dc943a93e083f1e531bfdc6779e57de40d0 (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < fc902f52a02298c7432b2334c0c82a2885a1a8b6 (git) Affected: 2793a23aacbd754dbbb5cb75093deb7e4103bace , < 3b9a324e646d3657a8d9806dfbfe4f3e4066e882 (git) Affected: f58a6c08ebdfa978178bbca78c2ba744a2665912 (git) Affected: 1df16498dfd0d5a129bdf2982d9a08df73e8923d (git) Affected: 8b8d278aa4de9335682bbd4a3bb619af015c859e (git) Affected: 6804052fa9d86e9a512c88b24a5debbfc1a490fc (git) Affected: 3.2.80 , < 3.2.81 (semver) Affected: 3.16.36 , < 3.17 (semver) Affected: 4.1.28 , < 4.2 (semver) Affected: 4.4.8 , < 4.5 (semver) Affected: 4.5.2 , < 4.6 (semver)	guessed
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (semver) Unaffected: 3.2.81 , ≤ 3.2.* (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53fd7f912c0877647d6a1e1877f5ea8535ee0b4a",
              "status": "affected",
              "version": "b5518429e70cd783b8ca52335456172c1a0589f6",
              "versionType": "git"
            },
            {
              "lessThan": "fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "8fc9816404166a90ed8d544dc52482fafffb6d9f",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "b0f92a5731dc82556a9ae005cc35f71ab136307b",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "99df6b7a713f96eda206680d100b76e15f9d9b69",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "74e035f07f53feca09e2352e77fccb09cad5e208",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "dbb30dc943a93e083f1e531bfdc6779e57de40d0",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "fc902f52a02298c7432b2334c0c82a2885a1a8b6",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "3b9a324e646d3657a8d9806dfbfe4f3e4066e882",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f58a6c08ebdfa978178bbca78c2ba744a2665912",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1df16498dfd0d5a129bdf2982d9a08df73e8923d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d278aa4de9335682bbd4a3bb619af015c859e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6804052fa9d86e9a512c88b24a5debbfc1a490fc",
              "versionType": "git"
            },
            {
              "lessThan": "3.2.81",
              "status": "affected",
              "version": "3.2.80",
              "versionType": "semver"
            },
            {
              "lessThan": "3.17",
              "status": "affected",
              "version": "3.16.36",
              "versionType": "semver"
            },
            {
              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.28",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.8",
              "versionType": "semver"
            },
            {
              "lessThan": "4.6",
              "status": "affected",
              "version": "4.5.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "3.2.*",
              "status": "unaffected",
              "version": "3.2.81",
              "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": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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": "3.2.81",
                  "versionStartIncluding": "3.2.80",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.16.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.1.28",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\n\ndev_validate_header() reads dev-\u003ehard_header_len directly when\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\n\n    if (capable(CAP_SYS_RAWIO)) {\n        memset(ll_header + len, 0, dev-\u003ehard_header_len - len);\n        return true;\n    }\n\nPacket send paths call dev_validate_header() on skbs whose headroom was\nallocated from an earlier hard_header_len read. If the device is\nreconfigured so that dev-\u003ehard_header_len increases before validation,\nthe memset writes past the reserved buffer, an out-of-bounds write.\n\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\nthe same concurrent increase can first make skb_push() exceed the\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\nbranch before making those hard_header_len reads consistent, so the\nsnapshot fixes do not turn a loud panic into a silent overwrite.\n\nThis path is only reached for variable length L2 protocols, where\nlen \u003c hard_header_len but len \u003e= min_header_len. No remaining in-tree\nvariable length L2 protocol implements header_ops-\u003evalidate, and the\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\nreal value beyond allowing testing of intentionally malformed input.\n\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\ndev-\u003ehard_header_len in dev_validate_header() are comparisons only and\nhave no memory safety impact."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T08:21:48.924Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b"
        },
        {
          "url": "https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69"
        },
        {
          "url": "https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882"
        }
      ],
      "title": "net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80731",
    "datePublished": "2026-09-03T08:21:48.924Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-03T08:21:48.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80731",
      "date": "2026-09-03",
      "epss": "0.00244",
      "percentile": "0.15435"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80731\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-03T13:06:11.707\",\"lastModified\":\"2026-09-03T13:06:11.707\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\\n\\ndev_validate_header() reads dev-\u003ehard_header_len directly when\\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\\n\\n    if (capable(CAP_SYS_RAWIO)) {\\n        memset(ll_header + len, 0, dev-\u003ehard_header_len - len);\\n        return true;\\n    }\\n\\nPacket send paths call dev_validate_header() on skbs whose headroom was\\nallocated from an earlier hard_header_len read. If the device is\\nreconfigured so that dev-\u003ehard_header_len increases before validation,\\nthe memset writes past the reserved buffer, an out-of-bounds write.\\n\\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\\nthe same concurrent increase can first make skb_push() exceed the\\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\\nbranch before making those hard_header_len reads consistent, so the\\nsnapshot fixes do not turn a loud panic into a silent overwrite.\\n\\nThis path is only reached for variable length L2 protocols, where\\nlen \u003c hard_header_len but len \u003e= min_header_len. No remaining in-tree\\nvariable length L2 protocol implements header_ops-\u003evalidate, and the\\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\\nreal value beyond allowing testing of intentionally malformed input.\\n\\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\\ndev-\u003ehard_header_len in dev_validate_header() are comparisons only and\\nhave no memory safety impact.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/netdevice.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b5518429e70cd783b8ca52335456172c1a0589f6\",\"lessThan\":\"53fd7f912c0877647d6a1e1877f5ea8535ee0b4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"8fc9816404166a90ed8d544dc52482fafffb6d9f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"b0f92a5731dc82556a9ae005cc35f71ab136307b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"99df6b7a713f96eda206680d100b76e15f9d9b69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"74e035f07f53feca09e2352e77fccb09cad5e208\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"dbb30dc943a93e083f1e531bfdc6779e57de40d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"fc902f52a02298c7432b2334c0c82a2885a1a8b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2793a23aacbd754dbbb5cb75093deb7e4103bace\",\"lessThan\":\"3b9a324e646d3657a8d9806dfbfe4f3e4066e882\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f58a6c08ebdfa978178bbca78c2ba744a2665912\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df16498dfd0d5a129bdf2982d9a08df73e8923d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b8d278aa4de9335682bbd4a3bb619af015c859e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6804052fa9d86e9a512c88b24a5debbfc1a490fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.2.80\",\"lessThan\":\"3.2.81\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.16.36\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.1.28\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.4.8\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.5.2\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/netdevice.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"3.2.81\",\"lessThanOrEqual\":\"3.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80731

Vulnerability from fkie_nvd - Published: 2026-09-03 13:06 - Updated: 2026-09-03 13:06

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53fd7f912c0877647d6a1e1877f5ea8535ee0b4a",
              "status": "affected",
              "version": "b5518429e70cd783b8ca52335456172c1a0589f6",
              "versionType": "git"
            },
            {
              "lessThan": "fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "8fc9816404166a90ed8d544dc52482fafffb6d9f",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "b0f92a5731dc82556a9ae005cc35f71ab136307b",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "99df6b7a713f96eda206680d100b76e15f9d9b69",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "74e035f07f53feca09e2352e77fccb09cad5e208",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "dbb30dc943a93e083f1e531bfdc6779e57de40d0",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "fc902f52a02298c7432b2334c0c82a2885a1a8b6",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "lessThan": "3b9a324e646d3657a8d9806dfbfe4f3e4066e882",
              "status": "affected",
              "version": "2793a23aacbd754dbbb5cb75093deb7e4103bace",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f58a6c08ebdfa978178bbca78c2ba744a2665912",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1df16498dfd0d5a129bdf2982d9a08df73e8923d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d278aa4de9335682bbd4a3bb619af015c859e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6804052fa9d86e9a512c88b24a5debbfc1a490fc",
              "versionType": "git"
            },
            {
              "lessThan": "3.2.81",
              "status": "affected",
              "version": "3.2.80",
              "versionType": "semver"
            },
            {
              "lessThan": "3.17",
              "status": "affected",
              "version": "3.16.36",
              "versionType": "semver"
            },
            {
              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.28",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.8",
              "versionType": "semver"
            },
            {
              "lessThan": "4.6",
              "status": "affected",
              "version": "4.5.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "3.2.*",
              "status": "unaffected",
              "version": "3.2.81",
              "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": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\n\ndev_validate_header() reads dev-\u003ehard_header_len directly when\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\n\n    if (capable(CAP_SYS_RAWIO)) {\n        memset(ll_header + len, 0, dev-\u003ehard_header_len - len);\n        return true;\n    }\n\nPacket send paths call dev_validate_header() on skbs whose headroom was\nallocated from an earlier hard_header_len read. If the device is\nreconfigured so that dev-\u003ehard_header_len increases before validation,\nthe memset writes past the reserved buffer, an out-of-bounds write.\n\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\nthe same concurrent increase can first make skb_push() exceed the\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\nbranch before making those hard_header_len reads consistent, so the\nsnapshot fixes do not turn a loud panic into a silent overwrite.\n\nThis path is only reached for variable length L2 protocols, where\nlen \u003c hard_header_len but len \u003e= min_header_len. No remaining in-tree\nvariable length L2 protocol implements header_ops-\u003evalidate, and the\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\nreal value beyond allowing testing of intentionally malformed input.\n\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\ndev-\u003ehard_header_len in dev_validate_header() are comparisons only and\nhave no memory safety impact."
    }
  ],
  "id": "CVE-2026-80731",
  "lastModified": "2026-09-03T13:06:11.707",
  "metrics": {},
  "published": "2026-09-03T13:06:11.707",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-534X-F2QC-FGHV

Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header

dev_validate_header() reads dev->hard_header_len directly when zero-padding short link layer headers for CAP_SYS_RAWIO holders:

if (capable(CAP_SYS_RAWIO)) {
    memset(ll_header + len, 0, dev->hard_header_len - len);
    return true;
}

Packet send paths call dev_validate_header() on skbs whose headroom was allocated from an earlier hard_header_len read. If the device is reconfigured so that dev->hard_header_len increases before validation, the memset writes past the reserved buffer, an out-of-bounds write.

This out-of-bounds write is masked in some SOCK_RAW paths today because the same concurrent increase can first make skb_push() exceed the reserved headroom and trigger skb_under_panic(). Remove the zero-padding branch before making those hard_header_len reads consistent, so the snapshot fixes do not turn a loud panic into a silent overwrite.

This path is only reached for variable length L2 protocols, where len < hard_header_len but len >= min_header_len. No remaining in-tree variable length L2 protocol implements header_ops->validate, and the CAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no real value beyond allowing testing of intentionally malformed input.

Drop the CAP_SYS_RAWIO branch. The remaining reads of dev->hard_header_len in dev_validate_header() are comparisons only and have no memory safety impact.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-80731"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-03T13:06:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\n\ndev_validate_header() reads dev-\u003ehard_header_len directly when\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\n\n    if (capable(CAP_SYS_RAWIO)) {\n        memset(ll_header + len, 0, dev-\u003ehard_header_len - len);\n        return true;\n    }\n\nPacket send paths call dev_validate_header() on skbs whose headroom was\nallocated from an earlier hard_header_len read. If the device is\nreconfigured so that dev-\u003ehard_header_len increases before validation,\nthe memset writes past the reserved buffer, an out-of-bounds write.\n\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\nthe same concurrent increase can first make skb_push() exceed the\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\nbranch before making those hard_header_len reads consistent, so the\nsnapshot fixes do not turn a loud panic into a silent overwrite.\n\nThis path is only reached for variable length L2 protocols, where\nlen \u003c hard_header_len but len \u003e= min_header_len. No remaining in-tree\nvariable length L2 protocol implements header_ops-\u003evalidate, and the\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\nreal value beyond allowing testing of intentionally malformed input.\n\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\ndev-\u003ehard_header_len in dev_validate_header() are comparisons only and\nhave no memory safety impact.",
  "id": "GHSA-534x-f2qc-fghv",
  "modified": "2026-09-03T15:32:14Z",
  "published": "2026-09-03T15:32:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

CVE-2026-80731 (GCVE-0-2026-80731)

FKIE_CVE-2026-80731

GHSA-534X-F2QC-FGHV

Tags

Sightings

Nomenclature