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netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-23456

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23456

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "a2cd54b9348e485d338b3c132338a4410c99afaf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "c95dc674ebf01ecfb40388b6facfc89b81fed3b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "41b417ff73a24b2c68134992cc44c88db27f482d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "52235bf88159a1ef16434ab49e47e99c8a09ab20",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "774a434f8c9c8602a976b2536f65d0172a07f4d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "6bce72daeccca9aa1746e92d6c3d4784e71f2ebb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "fb6c3596823ec5dd09c2123340330d7448f51a59",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
        "lessThan": "1e3a3593162c96e8a8de48b1e14f60c3b57fca8a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_h323_asn1.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.17"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.17",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_h323_asn1.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23456

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39858 · Revision 1
Added to Heist Feed
Publisher date
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