GHSA-W255-5HJQ-7P69

Vulnerability from github – Published: 2024-04-17 12:32 – Updated: 2025-04-02 15:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_conntrack_h323: Add protection for bmp length out of range

UBSAN load reports an exception of BRK#5515 SHIFT_ISSUE:Bitwise shifts that are out of bounds for their data type.

vmlinux get_bitmap(b=75) + 712 vmlinux decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956 vmlinux decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216 vmlinux decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812 vmlinux decode_choice(base=0xFFFFFFD008037280, level=0) + 1216 vmlinux DecodeRasMessage() + 304 vmlinux ras_help() + 684 vmlinux nf_confirm() + 188

Due to abnormal data in skb->data, the extension bitmap length exceeds 32 when decoding ras message then uses the length to make a shift operation. It will change into negative after several loop. UBSAN load could detect a negative shift as an undefined behaviour and reports exception. So we add the protection to avoid the length exceeding 32. Or else it will return out of range error and stop decoding.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-26851"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-17T11:15:08Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: Add protection for bmp length out of range\n\nUBSAN load reports an exception of BRK#5515 SHIFT_ISSUE:Bitwise shifts\nthat are out of bounds for their data type.\n\nvmlinux   get_bitmap(b=75) + 712\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:0\u003e\nvmlinux   decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:592\u003e\nvmlinux   decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e\nvmlinux   decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:576\u003e\nvmlinux   decode_choice(base=0xFFFFFFD008037280, level=0) + 1216\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e\nvmlinux   DecodeRasMessage() + 304\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:833\u003e\nvmlinux   ras_help() + 684\n\u003cnet/netfilter/nf_conntrack_h323_main.c:1728\u003e\nvmlinux   nf_confirm() + 188\n\u003cnet/netfilter/nf_conntrack_proto.c:137\u003e\n\nDue to abnormal data in skb-\u003edata, the extension bitmap length\nexceeds 32 when decoding ras message then uses the length to make\na shift operation. It will change into negative after several loop.\nUBSAN load could detect a negative shift as an undefined behaviour\nand reports exception.\nSo we add the protection to avoid the length exceeding 32. Or else\nit will return out of range error and stop decoding.",
  "id": "GHSA-w255-5hjq-7p69",
  "modified": "2025-04-02T15:30:53Z",
  "published": "2024-04-17T12:32:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26851"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbc"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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