GHSA-GHXC-PM62-H5FX

Vulnerability from github – Published: 2025-04-02 15:31 – Updated: 2025-11-03 21:33
VLAI
Details

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

iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()

When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-21993"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-02T13:15:43Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()\n\nWhen performing an iSCSI boot using IPv6, iscsistart still reads the\n/sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix\nlength is 64, this causes the shift exponent to become negative,\ntriggering a UBSAN warning. As the concept of a subnet mask does not\napply to IPv6, the value is set to ~0 to suppress the warning message.",
  "id": "GHSA-ghxc-pm62-h5fx",
  "modified": "2025-11-03T21:33:28Z",
  "published": "2025-04-02T15:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21993"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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