CVE-2026-23456 (GCVE-0-2026-23456)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-04-18 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case In decode_int(), the CONS case calls get_bits(bs, 2) to read a length value, then calls get_uint(bs, len) without checking that len bytes remain in the buffer. The existing boundary check only validates the 2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint() reads. This allows a malformed H.323/RAS packet to cause a 1-4 byte slab-out-of-bounds read. Add a boundary check for len bytes after get_bits() and before get_uint().
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_h323_asn1.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.17"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
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              "status": "unaffected",
              "version": "6.18.20",
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              "version": "6.19.10",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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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\nnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:59:05.486Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d"
        },
        {
          "url": "https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20"
        },
        {
          "url": "https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"
        }
      ],
      "title": "netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23456",
    "datePublished": "2026-04-03T15:15:37.534Z",
    "dateReserved": "2026-01-13T15:37:46.020Z",
    "dateUpdated": "2026-04-18T08:59:05.486Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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