{"schema":"threatline.record/2","record":{"id":"CVE-2026-97965","aliases":[],"summary":"vxlan: initialize _md in vxlan_xmit_one()","details":"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->key.tun_flags)) {\n                        if (info->options_len < 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 & VXLAN_F_GBP)\n                vxlan_build_gbp_hdr(vxh, md);\n\nInside vxlan_build_gbp_hdr(), md->gbp is read:\n\n        if (!md->gbp)\n                return;\n        gbp = (struct vxlanhdr_gbp *)vxh;\n        ...\n        if (md->gbp & VXLAN_GBP_DONT_LEARN)\n                gbp->dont_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->dont_learn and gbp->policy_applied to be set from stack bits.\n3) gbp->policy_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->gbp remains 0, and vxlan_build_gbp_hdr() returns early\nwithout modifying the VXLAN header.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97965","source_modified_at":"2026-10-21T12:53:54.233Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"ee122c79d4227f6ec642157834b6a90fcffa4382","lessThan":"fb78beb64e0e79557e4cd7cd17fea744bb6f01d9","status":"affected","versionType":"git"},{"version":"ee122c79d4227f6ec642157834b6a90fcffa4382","lessThan":"0d13b5a413bffc8718b3821b78537ccc6596c233","status":"affected","versionType":"git"},{"version":"ee122c79d4227f6ec642157834b6a90fcffa4382","lessThan":"bfb74c48ac2d31476d5e09cf9658844508d2608a","status":"affected","versionType":"git"},{"version":"ee122c79d4227f6ec642157834b6a90fcffa4382","lessThan":"081f22177d9d12b1e381b787f203cd5f47508187","status":"affected","versionType":"git"},{"version":"ee122c79d4227f6ec642157834b6a90fcffa4382","lessThan":"be83178bfc44588f6e3adb827ed874c683193466","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97965","source_modified_at":"2026-10-21T12:53:54.233Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.3","status":"affected"},{"version":"0","lessThan":"4.3","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97965","source_modified_at":"2026-10-21T12:53:54.233Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0d13b5a413bffc8718b3821b78537ccc6596c233","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97965","source_modified_at":"2026-10-21T12:53:54.233Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"081f22177d9d12b1e381b787f203cd5f47508187","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05745,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:07.952Z","modified_at":"2026-10-21T12:53:54.233Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97965","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:53:54.233Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97965","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/fb78beb64e0e79557e4cd7cd17fea744bb6f01d9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0d13b5a413bffc8718b3821b78537ccc6596c233"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bfb74c48ac2d31476d5e09cf9658844508d2608a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/081f22177d9d12b1e381b787f203cd5f47508187"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/be83178bfc44588f6e3adb827ed874c683193466"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:53:54.233Z","content_hash":"19f18bed7f2c1c9ed183690312a640ec241d07cc0c084c297bc31a22e5d1bf10"}}