{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80681",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80681"
  ],
  "published": "2026-08-28T06:53:24Z",
  "summary": "vxlan: re-fetch eth header after route_shortcircuit()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: re-fetch eth header after route_shortcircuit()\n\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\n\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb->head.\n\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth->h_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80681"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is in vxlan_xmit(), reached when the kernel transmits packets out a VXLAN netdev via routing, bridging, or overlay forwarding; remote peers can inject IPv4/IPv6 Ethernet frames that traverse this TX path on cloud, Kubernetes, and data-center VXLAN deployments.\nAC:L - An attacker controlling overlay or forwarded traffic can reliably meet RSC prerequisites (router FDB entry, IPv4/IPv6 ethertype, neighbour MAC mismatch, cloned/nonlinear skb) so route_shortcircuit() calls pskb_may_pull/skb_cow_head and reallocates skb->head, invalidating the cached eth pointer.\nPR:N - Exploitation requires only sending network traffic processed by an existing VXLAN interface with RSC enabled, not host administrator credentials; remote overlay peers and unauthenticated senders whose packets are forwarded through VXLAN need no elevated privileges on the target.\nUI:N - The use-after-free is triggered automatically during kernel packet transmit processing in vxlan_xmit() with no action required from a local user or administrator beyond normal network operation on a VXLAN-enabled host.\nS:U - The stale eth_hdr pointer causes heap use-after-free within the kernel's own memory domain during VXLAN transmit processing; impact is standard in-kernel memory corruption and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - After route_shortcircuit() reallocates skb->head, vxlan_xmit() dereferences the stale eth pointer for eth->h_dest, constituting a heap use-after-free read that can disclose adjacent freed slab contents and support further kernel memory disclosure primitives.\nI:H - Use-after-free of the Ethernet header buffer in skb head memory enables attacker-controlled reuse of freed kmalloc slabs, a well-established path to heap grooming and arbitrary kernel memory corruption or control-flow hijacking beyond the immediate MAC header read.\nA:H - Dereferencing a freed skb head pointer in vxlan_xmit() can cause an immediate kernel oops or panic from invalid memory access, and UAF heap corruption routinely destabilizes or crashes the system even when full exploitation is not pursued."
    }
  }
}