Vulnerability-Lookup

FKIE_CVE-2026-74582

Vulnerability from fkie_nvd - Published: 2026-08-21 17:16 - Updated: 2026-08-27 13:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in non-ring send paths packet_snd() reads dev->hard_header_len multiple times while allocating and constructing an skb. Device reconfiguration can change this value concurrently, for example through bonding device type changes. For SOCK_RAW, packet_snd() can save a larger value in reserve and later allocate headroom using a smaller value. Moving skb->data back by reserve then places it before skb->head, and the following copy from userspace can attempt an out-of-bounds write. packet_sendmsg_spkt() has the same issue because it calculates its reservation and header offset from separate reads before dropping the RCU read lock to allocate the skb. Add LL_RESERVED_SPACE_EX() for callers that already saved a header length. Read hard_header_len once in packet_snd() and use it for allocation and construction. In packet_sendmsg_spkt(), preserve the allocation-time value through the device lookup retry. The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "142e287b3a25cfe909215177c23243e7fc5ae2b1",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "91f041451f967cd87ed722a8f43c0b767a64f1a0",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "b06b6fce6d7deaf7238e09b48ce3b1125ff41acd",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "03390aa32e669cc4ecd7d34108e2e1afc13d689d",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "01a658c1b9d4b5393c38d5a92d9112ab1425382a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8809ae6747e760e6f1d2453ceb08c9bcc4939766",
              "versionType": "git"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.133",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.103",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.44",
              "versionType": "semver"
            },
            {
              "lessThan": "4.17",
              "status": "affected",
              "version": "4.16.12",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "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\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev-\u003ehard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb-\u003edata back by reserve\nthen places it before skb-\u003ehead, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops-\u003ecreate is not addressed here."
    }
  ],
  "id": "CVE-2026-74582",
  "lastModified": "2026-08-27T13:18:34.533",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-21T17:16:44.507",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74582 (GCVE-0-2026-74582)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-08-27 12:39

Title

packet: use consistent hard_header_len in non-ring send paths

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/bcd4df60ac9481b1c…
https://git.kernel.org/stable/c/78a47127e33c340bc…
https://git.kernel.org/stable/c/142e287b3a25cfe90…
https://git.kernel.org/stable/c/91f041451f967cd87…
https://git.kernel.org/stable/c/9052756290962ffb9…
https://git.kernel.org/stable/c/5bb10753d428aadfc…
https://git.kernel.org/stable/c/b06b6fce6d7deaf72…
https://git.kernel.org/stable/c/03390aa32e669cc4e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812 (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 78a47127e33c340bc6d38dcc4552a094b4f5cc77 (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 142e287b3a25cfe909215177c23243e7fc5ae2b1 (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 91f041451f967cd87ed722a8f43c0b767a64f1a0 (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 9052756290962ffb9a661bcf319e92dedaaedfed (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 5bb10753d428aadfc356a2bfe9acea09c82a62ec (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < b06b6fce6d7deaf7238e09b48ce3b1125ff41acd (git) Affected: b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba , < 03390aa32e669cc4ecd7d34108e2e1afc13d689d (git) Affected: d9fb8cc230b2a4757e9fe4f81468f81212d4deaa (git) Affected: 6190cce26e40bf71c4d375b21eea74bb07b6a0f3 (git) Affected: 01a658c1b9d4b5393c38d5a92d9112ab1425382a (git) Affected: 8809ae6747e760e6f1d2453ceb08c9bcc4939766 (git) Affected: 4.4.133 , < 4.5 (semver) Affected: 4.9.103 , < 4.10 (semver) Affected: 4.14.44 , < 4.15 (semver) Affected: 4.16.12 , < 4.17 (semver)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 5.10.267 , ≤ 5.10.* (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed",
              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "b06b6fce6d7deaf7238e09b48ce3b1125ff41acd",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "01a658c1b9d4b5393c38d5a92d9112ab1425382a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8809ae6747e760e6f1d2453ceb08c9bcc4939766",
              "versionType": "git"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.133",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.103",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.44",
              "versionType": "semver"
            },
            {
              "lessThan": "4.17",
              "status": "affected",
              "version": "4.16.12",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "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": "5.10.267",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.218",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.185",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.4.133",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.9.103",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.44",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.16.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev-\u003ehard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb-\u003edata back by reserve\nthen places it before skb-\u003ehead, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops-\u003ecreate is not addressed here."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in packet_snd() and packet_sendmsg_spkt() on the local AF_PACKET sendmsg() transmit path; it is not triggered by processing remotely received network traffic or pre-authentication network services.\nAC:L - An attacker in a user+network namespace can open an AF_PACKET SOCK_RAW socket and concurrently reconfigure the bound netdev (bonding/VLAN/macvlan/team) to change hard_header_len, controlling both sides of the race without external timing.\nPR:L - Exploitation requires CAP_NET_RAW to create AF_PACKET sockets and CAP_NET_ADMIN to change netdev hard_header_len; both are obtainable by an unprivileged user inside a user namespace without init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers the bug using their own packet socket sendmsg calls and concurrent netdev reconfiguration threads.\nS:U - Impact is kernel heap corruption and local privilege escalation within the same kernel security domain; it does not constitute a VM escape, sandbox breakout, or IOMMU boundary bypass.\nC:H - Racing hard_header_len can place skb-\u003edata before skb-\u003ehead, and skb_copy_datagram_from_iter/memcpy_from_msg then writes attacker-controlled data outside the skb buffer, corrupting adjacent slab objects and enabling kernel memory disclosure.\nI:H - Inconsistent hard_header_len between skb allocation and header adjustment causes out-of-bounds kernel heap writes of attacker-controlled packet data, yielding corruption primitives suitable for control-flow hijacking and local privilege escalation.\nA:H - Out-of-bounds skb buffer writes corrupt kmalloc metadata and can trigger kernel oops/panic, causing reliable denial of service even when full exploitation is not completed."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:39:47.499Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"
        },
        {
          "url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"
        },
        {
          "url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"
        },
        {
          "url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"
        },
        {
          "url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"
        }
      ],
      "title": "packet: use consistent hard_header_len in non-ring send paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74582",
    "datePublished": "2026-08-21T16:31:55.283Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-27T12:39:47.499Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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FKIE_CVE-2026-74582

CVE-2026-74582 (GCVE-0-2026-74582)

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