{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9"
            },
            {
              "fixed": "e12c4663529699f457b2988c1dfedf4d13b3b3be"
            },
            {
              "fixed": "47bfcc871576eaef6c8edab6749acd4b317306ea"
            },
            {
              "fixed": "a9ec10815199f9879ba080241dc555efb1daf324"
            },
            {
              "fixed": "daebc7064a1b4c12c98e52c4bceede7f2fcd573c"
            },
            {
              "fixed": "ad32e564c62ebf5ba76dd60a22af52c69d54d17b"
            },
            {
              "fixed": "984f831dda31b3a18f47454cf64989f65402879e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89776.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes\n\nThe VXLAN VNI filter entry policy declares the GROUP/GROUP6 address\nattributes as NLA_BINARY with only a maximum length, so validate_nla()\naccepts a payload shorter than the address. The GROUP consumer reads it\nwith nla_get_in_addr(), an unconditional 4-byte load, so a short\nattribute over-reads up to 3 bytes of uninitialised slab data, which are\nstored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing\nkernel memory.\n\nSwitch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects\nany GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is\nalways sent at full width.",
  "id": "CVE-2026-89776",
  "modified": "2026-09-18T03:31:03.326727783Z",
  "published": "2026-09-16T08:48:17.084Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89776.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89776"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes"
}