{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74705",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74705"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "udp: fix potential use-after-free in tunnel segmentation",
  "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->head,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
    }
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            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74705"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 10.0,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Remote peers reach __skb_udp_tunnel_segment on egress when GRO-coalesced VXLAN/Geneve/FOU GSO superpackets are forwarded or re-encapsulated through dev_queue_xmit, and malicious virtio-net/cloud tenants can inject VIRTIO_NET_HDR_GSO_UDP_TUNNEL frames the host later segments on physical or overlay NICs.\nAC:L - Triggering is deterministic once a GSO UDP-tunnel skb has tunnel headers beyond skb_headlen so pskb_may_pull reallocates skb->head; attackers control that layout via fragmented or GRO-built outer/encap headers and can repeat crafted sends until segmentation dereferences the stale UDP pointer.\nPR:N - No host authentication or credentials are required to send UDP tunnel traffic to listening overlay ports on cloud/DC nodes, and co-resident virtio-net guests or tenant VMs can emit GSO UDP-tunnel frames into the host datapath without CAP_NET_ADMIN on the victim host.\nUI:N - Exploitation needs only crafted encapsulated GSO traffic into an already-running overlay, bridge, IPVS, OVS, or virtio forwarding path; no victim file open, mount, link click, or other interactive action beyond normal network or VM I/O.\nS:C - In cloud/Kubernetes and virtio-net multitenant deployments, remote or guest/tenant senders can corrupt hypervisor kernel heap during host-side UDP-tunnel GSO segmentation on egress, crossing the VM/container-to-host security boundary rather than staying within the attacker's own namespace.\nC:H - After pskb_may_pull reallocates skb->head, the pre-pull udp_hdr pointer is stale yet uh->len and uh->check are read for checksum adjustment, yielding a classic heap use-after-free read primitive that can disclose kernel memory and support further exploitation.\nI:H - UAF on the UDP header allows attacker-influenced heap reuse and corruption of header fields and checksum state during tunnel GSO segmentation, providing a write/control primitive suitable for kernel code execution rather than a benign checksum miscalculation.\nA:H - Dereferencing the freed UDP header during GSO segmentation can immediately oops or panic the kernel, and repeated exploitation attempts against this UAF commonly crash or hang the host even when full control is not achieved."
    }
  }
}