{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "include/net/ip_tunnels.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "127c5e6e2d6fa8185314537c08204ec3515eae99",
              "status": "affected",
              "version": "1db9041e91ac574f1cecc0e98e69ac35832e8088",
              "versionType": "git"
            },
            {
              "lessThan": "e40e2d11ced8119d3e4469ebe91264bc1cf71530",
              "status": "affected",
              "version": "cb1c1f3b7ef908408064734fb6bdaf5811b8b84c",
              "versionType": "git"
            },
            {
              "lessThan": "5d562153b4719234227f99c2fb529f98a6a44d15",
              "status": "affected",
              "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc",
              "versionType": "git"
            },
            {
              "lessThan": "0d087d00161f562d5047cc4009bb0c6a19daf9f1",
              "status": "affected",
              "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc",
              "versionType": "git"
            },
            {
              "lessThan": "8431c602f551549f082bbfa67f3003f2d8e3e132",
              "status": "affected",
              "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.160",
              "status": "affected",
              "version": "6.6.153",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "include/net/ip_tunnels.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "6.6.153",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev-\u003e{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - An unauthenticated remote peer can trigger the affected VXLAN/Geneve tunnel transmit path by sending traffic that a configured host routes or bridges out through the tunnel. This reaches `udp_tunnel[6]_xmit_skb()` and then `iptunnel_xmit_stats()` via normal network packet forwarding/output.\nAC:L - Once an affected 32-bit VXLAN/Geneve deployment exists, triggering is just repeated packet transmission through the tunnel. There is no attacker-uncontrolled race or fragile timing requirement.\nPR:N - For an already configured tunnel endpoint, the attacker does not need local privileges or authentication to cause network traffic to traverse the vulnerable transmit path. Although creating such devices requires `CAP_NET_ADMIN`, exploitation of an existing network-facing deployment does not.\nUI:N - No victim user action is required. Packet forwarding/output and statistics updates occur automatically in the kernel.\nS:U - The vulnerable code and the resulting corruption/freeze are within the same kernel/network-device security authority. This is not a VM escape or cross-authority boundary bypass.\nC:N - The bug corrupts per-CPU tunnel statistics/synchronization state rather than exposing kernel memory. No plausible arbitrary read or information disclosure primitive is evident.\nI:L - The direct integrity impact is limited corruption of network device statistics fields due to using the wrong per-CPU stats layout. The fixed write pattern does not provide a general arbitrary write or control-flow primitive.\nA:H - On 32-bit kernels, the wrong `syncp` offset can corrupt sequence/stat state and cause freezes or repeated kernel-side stalls when stats are read. This can produce a high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:39:14.669Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/127c5e6e2d6fa8185314537c08204ec3515eae99"
        },
        {
          "url": "https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132"
        }
      ],
      "title": "ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23459",
    "datePublished": "2026-04-03T15:15:39.665Z",
    "dateReserved": "2026-01-13T15:37:46.021Z",
    "dateUpdated": "2026-10-21T12:39:14.669Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}