{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa"
            },
            {
              "fixed": "45a67662bf8ce3aa5643accf98d328dfbb47eaf6"
            },
            {
              "fixed": "315d42ca39f69846662961c25dcf2bb07c350d14"
            },
            {
              "fixed": "a3c5eb6e382dd426a5e7eb08608897ed57167ff7"
            },
            {
              "fixed": "ff022fd9d0f0282c575e11778b96bd1b637503eb"
            },
            {
              "fixed": "481506a756dcd828ef42391cb08f38d8d96d38fc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3.12.18"
            },
            {
              "fixed": "3.13"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3.13.10"
            },
            {
              "fixed": "3.14"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "d8be18c52dbc94989f6d74637b731af39cd3d902"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3927dace523706cc00f808520eaf2125dd7c07b5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.14.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98568.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation.",
  "id": "CVE-2026-98568",
  "modified": "2026-10-20T02:30:15.260997049Z",
  "published": "2026-10-18T15:18:34.562Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98568.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98568"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "vxlan: use one headroom snapshot for neighbour replies"
}