CVE-2026-97965 (GCVE-0-2026-97965)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-10-21 12:53
VLAI
Title
vxlan: initialize _md in vxlan_xmit_one()
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: initialize _md in vxlan_xmit_one() If a VXLAN device is configured with both VXLAN_F_COLLECT_METADATA and VXLAN_F_GBP, and a packet is transmitted through it using an external ip_tunnel_info that lacks the IP_TUNNEL_VXLAN_OPT_BIT flag, md is left pointing to the uninitialized _md stack variable: if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { if (info->options_len < sizeof(*md)) goto drop; md = ip_tunnel_info_opts(info); } Because IP_TUNNEL_VXLAN_OPT_BIT is not set, md is not updated and remains pointing to _md. Later, vxlan_build_skb() is called with md, which eventually calls vxlan_build_gbp_hdr(): if (vxflags & VXLAN_F_GBP) vxlan_build_gbp_hdr(vxh, md); Inside vxlan_build_gbp_hdr(), md->gbp is read: if (!md->gbp) return; gbp = (struct vxlanhdr_gbp *)vxh; ... if (md->gbp & VXLAN_GBP_DONT_LEARN) gbp->dont_learn = 1; If the stack contains garbage, this causes: 1) VXLAN_HF_GBP flag to be spuriously set in the VXLAN header. 2) gbp->dont_learn and gbp->policy_applied to be set from stack bits. 3) gbp->policy_id to receive 16 bits of uninitialized kernel stack data, leaking it onto the wire. Fix this by zero-initializing _md. If IP_TUNNEL_VXLAN_OPT_BIT is not present, md->gbp remains 0, and vxlan_build_gbp_hdr() returns early without modifying the VXLAN header.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee122c79d4227f6ec642157834b6a90fcffa4382 , < fb78beb64e0e79557e4cd7cd17fea744bb6f01d9 (git)
Affected: ee122c79d4227f6ec642157834b6a90fcffa4382 , < 0d13b5a413bffc8718b3821b78537ccc6596c233 (git)
Affected: ee122c79d4227f6ec642157834b6a90fcffa4382 , < bfb74c48ac2d31476d5e09cf9658844508d2608a (git)
Affected: ee122c79d4227f6ec642157834b6a90fcffa4382 , < 081f22177d9d12b1e381b787f203cd5f47508187 (git)
Affected: ee122c79d4227f6ec642157834b6a90fcffa4382 , < be83178bfc44588f6e3adb827ed874c683193466 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "programFiles": [
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: initialize _md in vxlan_xmit_one()\n\nIf a VXLAN device is configured with both VXLAN_F_COLLECT_METADATA and\nVXLAN_F_GBP, and a packet is transmitted through it using an external\nip_tunnel_info that lacks the IP_TUNNEL_VXLAN_OPT_BIT flag, md is left\npointing to the uninitialized _md stack variable:\n\n                if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info-\u003ekey.tun_flags)) {\n                        if (info-\u003eoptions_len \u003c sizeof(*md))\n                                goto drop;\n                        md = ip_tunnel_info_opts(info);\n                }\n\nBecause IP_TUNNEL_VXLAN_OPT_BIT is not set, md is not updated and remains\npointing to _md. Later, vxlan_build_skb() is called with md, which\neventually calls vxlan_build_gbp_hdr():\n\n        if (vxflags \u0026 VXLAN_F_GBP)\n                vxlan_build_gbp_hdr(vxh, md);\n\nInside vxlan_build_gbp_hdr(), md-\u003egbp is read:\n\n        if (!md-\u003egbp)\n                return;\n        gbp = (struct vxlanhdr_gbp *)vxh;\n        ...\n        if (md-\u003egbp \u0026 VXLAN_GBP_DONT_LEARN)\n                gbp-\u003edont_learn = 1;\n\nIf the stack contains garbage, this causes:\n1) VXLAN_HF_GBP flag to be spuriously set in the VXLAN header.\n2) gbp-\u003edont_learn and gbp-\u003epolicy_applied to be set from stack bits.\n3) gbp-\u003epolicy_id to receive 16 bits of uninitialized kernel stack data,\n   leaking it onto the wire.\n\nFix this by zero-initializing _md. If IP_TUNNEL_VXLAN_OPT_BIT is not\npresent, md-\u003egbp remains 0, and vxlan_build_gbp_hdr() returns early\nwithout modifying the VXLAN header."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:53:54.233Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fb78beb64e0e79557e4cd7cd17fea744bb6f01d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d13b5a413bffc8718b3821b78537ccc6596c233"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfb74c48ac2d31476d5e09cf9658844508d2608a"
        },
        {
          "url": "https://git.kernel.org/stable/c/081f22177d9d12b1e381b787f203cd5f47508187"
        },
        {
          "url": "https://git.kernel.org/stable/c/be83178bfc44588f6e3adb827ed874c683193466"
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      "title": "vxlan: initialize _md in vxlan_xmit_one()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97965",
    "datePublished": "2026-09-25T10:23:07.952Z",
    "dateReserved": "2026-09-25T10:18:58.206Z",
    "dateUpdated": "2026-10-21T12:53:54.233Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-11-12",
      "epss": "0.00168",
      "percentile": "0.06269"
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    "microsoft_vex": {
      "current_release_date": "2026-11-07T01:51:25.000Z",
      "cve": "CVE-2026-97965",
      "id": "msrc_CVE-2026-97965",
      "initial_release_date": "2026-09-28T00:03:32.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vxlan: initialize _md in vxlan_xmit_one()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97965.json",
      "version": "5"
    },
    "nvd": {
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        "affected": [
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                "product": "Linux",
                "programFiles": [
                  "drivers/net/vxlan/vxlan_core.c"
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                "vendor": "Linux",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: initialize _md in vxlan_xmit_one()\n\nIf a VXLAN device is configured with both VXLAN_F_COLLECT_METADATA and\nVXLAN_F_GBP, and a packet is transmitted through it using an external\nip_tunnel_info that lacks the IP_TUNNEL_VXLAN_OPT_BIT flag, md is left\npointing to the uninitialized _md stack variable:\n\n                if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info-\u003ekey.tun_flags)) {\n                        if (info-\u003eoptions_len \u003c sizeof(*md))\n                                goto drop;\n                        md = ip_tunnel_info_opts(info);\n                }\n\nBecause IP_TUNNEL_VXLAN_OPT_BIT is not set, md is not updated and remains\npointing to _md. Later, vxlan_build_skb() is called with md, which\neventually calls vxlan_build_gbp_hdr():\n\n        if (vxflags \u0026 VXLAN_F_GBP)\n                vxlan_build_gbp_hdr(vxh, md);\n\nInside vxlan_build_gbp_hdr(), md-\u003egbp is read:\n\n        if (!md-\u003egbp)\n                return;\n        gbp = (struct vxlanhdr_gbp *)vxh;\n        ...\n        if (md-\u003egbp \u0026 VXLAN_GBP_DONT_LEARN)\n                gbp-\u003edont_learn = 1;\n\nIf the stack contains garbage, this causes:\n1) VXLAN_HF_GBP flag to be spuriously set in the VXLAN header.\n2) gbp-\u003edont_learn and gbp-\u003epolicy_applied to be set from stack bits.\n3) gbp-\u003epolicy_id to receive 16 bits of uninitialized kernel stack data,\n   leaking it onto the wire.\n\nFix this by zero-initializing _md. If IP_TUNNEL_VXLAN_OPT_BIT is not\npresent, md-\u003egbp remains 0, and vxlan_build_gbp_hdr() returns early\nwithout modifying the VXLAN header."
          }
        ],
        "id": "CVE-2026-97965",
        "lastModified": "2026-10-21T13:21:17.963",
        "metrics": {},
        "published": "2026-09-25T11:17:24.293",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-11-06T02:33:52+00:00",
      "cve": "CVE-2026-97965",
      "id": "CVE-2026-97965",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: initialize _md in vxlan_xmit_one()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97965.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-12T00:54:29Z",
      "cve": "CVE-2026-97965",
      "id": "CVE-2026-97965",
      "initial_release_date": "2026-09-28T23:42:05Z",
      "product_status:known_affected": "677",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "111",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97965",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97965.json",
      "version": "11"
    }
  }
}



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