CVE-2026-89776 (GCVE-0-2026-89776)
Vulnerability from cvelistv5
Published
2026-09-16 08:48
Modified
2026-10-19 08:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address attributes as NLA_BINARY with only a maximum length, so validate_nla() accepts a payload shorter than the address. The GROUP consumer reads it with nla_get_in_addr(), an unconditional 4-byte load, so a short attribute over-reads up to 3 bytes of uninitialised slab data, which are stored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing kernel memory. Switch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects any GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is always sent at full width.
References
Impacted products
Vendor Product Version
Linux Linux Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
Version: f9c4bb0b245cee35ef66f75bf409c9573d934cf9
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_vnifilter.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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            },
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            },
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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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: 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:28.559Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be"
        },
        {
          "url": "https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324"
        },
        {
          "url": "https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b"
        },
        {
          "url": "https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"
        }
      ],
      "title": "vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89776",
    "datePublished": "2026-09-16T08:48:17.084Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-10-19T08:52:28.559Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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