netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()_CVE-2026-23455

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()\n\nIn DecodeQ931(), the UserUserIE code path reads a 16-bit length from\nthe packet, then decrements it by 1 to skip the protocol discriminator\nbyte before passing it to DecodeH323_UserInformation(). If the encoded\nlength is 0, the decrement wraps to -1, which is then passed as a\nlarge value to the decoder, leading to an out-of-bounds read.\n\nAdd a check to ensure len is positive after the decrement.",
    "published": "2026-04-03T15:15:36.869Z",
    "modified": "2026-04-27T14:02:33.617Z",
    "type": "cve",
    "title": "netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0\nhttps://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710\nhttps://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4\nhttps://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60\nhttps://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111\nhttps://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8\nhttps://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b\nhttps://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66",
    "id": "CVE-2026-23455",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 5e35941d990123f155b02d5663e51a24f816b6f3\nLinux Linux 2.6.17",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "5e35941d990123f155b02d5663e51a24f816b6f3",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}