{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-54137",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-54137",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-24T13:06:52.689Z",
    "updatedAt": "2026-05-11T19:56:12.086Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "vfio/type1: fix cap_migration information leak",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: fix cap_migration information leak\n\nFix an information leak where an uninitialized hole in struct\nvfio_iommu_type1_info_cap_migration on the stack is exposed to userspace.\n\nThe definition of struct vfio_iommu_type1_info_cap_migration contains a hole as\nshown in this pahole(1) output:\n\n  struct vfio_iommu_type1_info_cap_migration {\n          struct vfio_info_cap_header header;              /*     0     8 */\n          __u32                      flags;                /*     8     4 */\n\n          /* XXX 4 bytes hole, try to pack */\n\n          __u64                      pgsize_bitmap;        /*    16     8 */\n          __u64                      max_dirty_bitmap_size; /*    24     8 */\n\n          /* size: 32, cachelines: 1, members: 4 */\n          /* sum members: 28, holes: 1, sum holes: 4 */\n          /* last cacheline: 32 bytes */\n  };\n\nThe cap_mig variable is filled in without initializing the hole:\n\n  static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,\n                         struct vfio_info_cap *caps)\n  {\n      struct vfio_iommu_type1_info_cap_migration cap_mig;\n\n      cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;\n      cap_mig.header.version = 1;\n\n      cap_mig.flags = 0;\n      /* support minimum pgsize */\n      cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap);\n      cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;\n\n      return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig));\n  }\n\nThe structure is then copied to a temporary location on the heap. At this point\nit's already too late and ioctl(VFIO_IOMMU_GET_INFO) copies it to userspace\nlater:\n\n  int vfio_info_add_capability(struct vfio_info_cap *caps,\n                   struct vfio_info_cap_header *cap, size_t size)\n  {\n      struct vfio_info_cap_header *header;\n\n      header = vfio_info_cap_add(caps, size, cap->id, cap->version);\n      if (IS_ERR(header))\n          return PTR_ERR(header);\n\n      memcpy(header + 1, cap + 1, size - sizeof(*header));\n\n      return 0;\n  }\n\nThis issue was found by code inspection.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad83d83dd891244de0d07678b257dc976db7c132"
            },
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "13fd667db999bffb557c5de7adb3c14f1713dd51"
            },
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f6f300ecc196d243c02adeb9ee0c62c677c24bfb"
            },
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cbac29a1caa49a34e131394e1f4d924a76d8b0c9"
            },
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1b5feb8497cdb5b9962db2700814bffbc030fb4a"
            },
            {
              "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cd24e2a60af633f157d7e59c0a6dba64f131c0b1"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.8",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.8"
            },
            {
              "version": "5.10.195",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.132",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.4.16",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.5.*"
            },
            {
              "version": "6.6",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}