{
  "cveId": "CVE-2023-40548",
  "url": "https://patchblox.com/security/cve/CVE-2023-40548",
  "summary": "CVE-2023-40548 is fixed in 5 products on 1 platform, first by shim 15.8-0ubuntu1, released January 22, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "shim: A buffer overflow was found in Shim in the 32-bit system",
  "description": "A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.",
  "published": "2024-01-22T16:00:00Z",
  "severity": "high",
  "cvss": 7.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00436,
  "epssPercentile": 0.38087,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "15.8-1~deb12u1",
      "fix": "DEBIAN-CVE-2023-40548",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40548",
      "released": "2024-01-29T15:15:08Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "15.8-1",
      "fix": "DEBIAN-CVE-2023-40548",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40548",
      "released": "2024-01-29T15:15:08Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 14",
      "fixedVersion": "15.8-1",
      "fix": "DEBIAN-CVE-2023-40548",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40548",
      "released": "2024-01-29T15:15:08Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-shim-15.8-0ubuntu1",
      "released": "2024-01-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-shim-15.8-0ubuntu1",
      "released": "2024-01-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "RHEL 8",
      "fixedVersion": "0:15.8-4.el8_9",
      "fix": "RHSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "RHEL 9",
      "fixedVersion": "0:15.8-4.el9_3",
      "fix": "RHSA-2024:1903",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1903",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "almalinux 8",
      "fixedVersion": "15.8-4.el8_9.alma.1",
      "fix": "ALSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "almalinux 9",
      "fixedVersion": "15.8-4.el9_3.alma.1",
      "fix": "ALSA-2024:1903",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1903",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "ol 8",
      "fixedVersion": "0:15.8-4.0.1.el8",
      "fix": "ELSA-2024-1902",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1902",
      "released": "2024-04-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-aa64",
      "release": "ol 9",
      "fixedVersion": "0:15.8-1.0.3.el9",
      "fix": "ELSA-2024-1903",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1903",
      "released": "2024-04-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-ia32",
      "release": "RHEL 8",
      "fixedVersion": "0:15.8-4.el8_9",
      "fix": "RHSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-ia32",
      "release": "almalinux 8",
      "fixedVersion": "15.8-4.el8_9.alma.1",
      "fix": "ALSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-ia32",
      "release": "ol 8",
      "fixedVersion": "0:15.8-4.0.1.el8",
      "fix": "ELSA-2024-1902",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1902",
      "released": "2024-04-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-signed",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.40.10\u002B15.8-0ubuntu1",
      "fix": "shim-signed 1.40.10\u002B15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shim-signed-1.40.10-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-signed",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.51.4\u002B15.8-0ubuntu1",
      "fix": "shim-signed 1.51.4\u002B15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-shim-signed-1.51.4-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-signed",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.58\u002B15.8-0ubuntu1",
      "fix": "shim-signed 1.58\u002B15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-shim-signed-1.58-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-signed",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "1.58\u002B15.8-0ubuntu1",
      "fix": "shim-signed 1.58\u002B15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-shim-signed-1.58-15.8-0ubuntu1",
      "released": "2024-01-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-signed",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.58",
      "fix": "shim-signed 1.58",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-shim-signed-1.58",
      "released": "2024-01-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "RHEL 8",
      "fixedVersion": "0:15.8-4.el8_9",
      "fix": "RHSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "RHEL 9",
      "fixedVersion": "0:15.8-4.el9_3",
      "fix": "RHSA-2024:1903",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1903",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "almalinux 8",
      "fixedVersion": "15.8-4.el8_9.alma.1",
      "fix": "ALSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1902",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "almalinux 9",
      "fixedVersion": "15.8-4.el9_3.alma.1",
      "fix": "ALSA-2024:1903",
      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1903",
      "released": "2024-04-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "ol 8",
      "fixedVersion": "0:15.8-4.0.1.el8",
      "fix": "ELSA-2024-1902",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1902",
      "released": "2024-04-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim-x64",
      "release": "ol 9",
      "fixedVersion": "0:15.8-1.0.3.el9",
      "fix": "ELSA-2024-1903",
      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1903",
      "released": "2024-04-22T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}