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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33
VLAI
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head, the saved UDP header pointer is no longer valid.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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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{
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          "programFiles": [
            "net/ipv4/udp_offload.c"
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              "version": "0",
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      "cpeApplicability": [
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              "operator": "OR"
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      "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": [
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          "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
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    "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",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.