GHSA-2256-5C36-MWCJ

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-09-10 15:32
VLAI
Details

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

netfilter: conntrack: remove sprintf usage

Replace it with scnprintf, the buffer sizes are expected to be large enough to hold the result, no need for snprintf+overflow check.

Increase buffer size in mangle_content_len() while at it.

BUG: KASAN: stack-out-of-bounds in vsnprintf+0xea5/0x1270 Write of size 1 at addr [..] vsnprintf+0xea5/0x1270 sprintf+0xb1/0xe0 mangle_content_len+0x1ac/0x280 nf_nat_sdp_session+0x1cc/0x240 process_sdp+0x8f8/0xb80 process_invite_request+0x108/0x2b0 process_sip_msg+0x5da/0xf50 sip_help_tcp+0x45e/0x780 nf_confirm+0x34d/0x990 [..]

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53002"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:11Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: remove sprintf usage\n\nReplace it with scnprintf, the buffer sizes are expected to be large enough\nto hold the result, no need for snprintf+overflow check.\n\nIncrease buffer size in mangle_content_len() while at it.\n\nBUG: KASAN: stack-out-of-bounds in vsnprintf+0xea5/0x1270\nWrite of size 1 at addr [..]\n vsnprintf+0xea5/0x1270\n sprintf+0xb1/0xe0\n mangle_content_len+0x1ac/0x280\n nf_nat_sdp_session+0x1cc/0x240\n process_sdp+0x8f8/0xb80\n process_invite_request+0x108/0x2b0\n process_sip_msg+0x5da/0xf50\n sip_help_tcp+0x45e/0x780\n nf_confirm+0x34d/0x990\n [..]",
  "id": "GHSA-2256-5c36-mwcj",
  "modified": "2026-09-10T15:32:53Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53002"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:64770"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:66000"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:66180"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-53002"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492329"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f793ba78470a99f40389b7dc60a81d9f5ad3956"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bbf829b4c1b44c941c47dd0d710f1393258f3d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e7066bdb481a87fe88c4fa563e348c03b2d373d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e3be0d12615a173fe260cd42753ca7a001acbf2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8e0a32a23d3f34862af3b4da792ecb3a891a9a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab64e61c9323fa6de21bd20da1ddb29a0fb65d34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c08ff52e44945e6ef4ce0790f49ea761b060c45b"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53002.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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