Vulnerability-Lookup

GHSA-RCM8-Q4CM-988V

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30

Details

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

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74705"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free.",
  "id": "GHSA-rcm8-q4cm-988v",
  "modified": "2026-08-22T18:30:29Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74705 (GCVE-0-2026-74705)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33

Title

udp: fix potential use-after-free in tunnel segmentation

Summary

In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/6a733a38b983d8c2e…
https://git.kernel.org/stable/c/19d89b13a43640b2d…
https://git.kernel.org/stable/c/b3df61bb745eb5201…
https://git.kernel.org/stable/c/1ae134c012e10384c…
https://git.kernel.org/stable/c/5161e67c561c4f28a…
https://git.kernel.org/stable/c/64d322c288577793e…
https://git.kernel.org/stable/c/588d4a6795d99d080…
https://git.kernel.org/stable/c/d0f86fb36eb260abd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 6a733a38b983d8c2e222f13968209010cf44de87 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 19d89b13a43640b2da2f277ee462d919d988cb6f (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < b3df61bb745eb5201eac22679a2839d4ccbf3442 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 1ae134c012e10384cdac420b5cc6e0615cde0b55 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 5161e67c561c4f28a5d9335a6e859b02511de92b (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 64d322c288577793eedd352b96ef75234ed380fe (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 588d4a6795d99d080f74ef0b5f391ea8c453ae5d (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < d0f86fb36eb260abd10007b62c9dcc1028e03e61 (git)
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6a733a38b983d8c2e222f13968209010cf44de87",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "19d89b13a43640b2da2f277ee462d919d988cb6f",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "b3df61bb745eb5201eac22679a2839d4ccbf3442",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "1ae134c012e10384cdac420b5cc6e0615cde0b55",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "5161e67c561c4f28a5d9335a6e859b02511de92b",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "64d322c288577793eedd352b96ef75234ed380fe",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "588d4a6795d99d080f74ef0b5f391ea8c453ae5d",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "d0f86fb36eb260abd10007b62c9dcc1028e03e61",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_offload.c"
          ],
          "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": "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": "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
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:04.110Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"
        },
        {
          "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"
        },
        {
          "url": "https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"
        },
        {
          "url": "https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"
        }
      ],
      "title": "udp: fix potential use-after-free in tunnel segmentation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74705",
    "datePublished": "2026-08-22T15:33:04.110Z",
    "dateReserved": "2026-08-15T05:44:03.927Z",
    "dateUpdated": "2026-08-22T15:33:04.110Z",
    "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

GHSA-RCM8-Q4CM-988V

CVE-2026-74705 (GCVE-0-2026-74705)

Tags

Sightings

Nomenclature