{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21993",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21993"
  ],
  "published": "2025-04-02T12:52:04Z",
  "summary": "iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()",
  "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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.132",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21993"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}