CVE-2023-54137 (GCVE-0-2023-54137)
Vulnerability from cvelistv5
Published
2025-12-24 13:06
Modified
2025-12-24 13:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vfio/type1: fix cap_migration information leak Fix an information leak where an uninitialized hole in struct vfio_iommu_type1_info_cap_migration on the stack is exposed to userspace. The definition of struct vfio_iommu_type1_info_cap_migration contains a hole as shown in this pahole(1) output: struct vfio_iommu_type1_info_cap_migration { struct vfio_info_cap_header header; /* 0 8 */ __u32 flags; /* 8 4 */ /* XXX 4 bytes hole, try to pack */ __u64 pgsize_bitmap; /* 16 8 */ __u64 max_dirty_bitmap_size; /* 24 8 */ /* size: 32, cachelines: 1, members: 4 */ /* sum members: 28, holes: 1, sum holes: 4 */ /* last cacheline: 32 bytes */ }; The cap_mig variable is filled in without initializing the hole: static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu, struct vfio_info_cap *caps) { struct vfio_iommu_type1_info_cap_migration cap_mig; cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION; cap_mig.header.version = 1; cap_mig.flags = 0; /* support minimum pgsize */ cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap); cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX; return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig)); } The structure is then copied to a temporary location on the heap. At this point it's already too late and ioctl(VFIO_IOMMU_GET_INFO) copies it to userspace later: int vfio_info_add_capability(struct vfio_info_cap *caps, struct vfio_info_cap_header *cap, size_t size) { struct vfio_info_cap_header *header; header = vfio_info_cap_add(caps, size, cap->id, cap->version); if (IS_ERR(header)) return PTR_ERR(header); memcpy(header + 1, cap + 1, size - sizeof(*header)); return 0; } This issue was found by code inspection.
References
Impacted products
Vendor Product Version
Linux Linux Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
Version: ad721705d09c62f0d108a6b4f59867ebfd592c90
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/vfio_iommu_type1.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/vfio_iommu_type1.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.195",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.132",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.195",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.132",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.53",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.16",
                  "versionStartIncluding": "5.8",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5.3",
                  "versionStartIncluding": "5.8",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 \u003c\u003c __ffs(iommu-\u003epgsize_bitmap);\n      cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;\n\n      return vfio_info_add_capability(caps, \u0026cap_mig.header, sizeof(cap_mig));\n  }\n\nThe structure is then copied to a temporary location on the heap. At this point\nit\u0027s 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-\u003eid, cap-\u003eversion);\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:06:52.689Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ad83d83dd891244de0d07678b257dc976db7c132"
        },
        {
          "url": "https://git.kernel.org/stable/c/13fd667db999bffb557c5de7adb3c14f1713dd51"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6f300ecc196d243c02adeb9ee0c62c677c24bfb"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbac29a1caa49a34e131394e1f4d924a76d8b0c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b5feb8497cdb5b9962db2700814bffbc030fb4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd24e2a60af633f157d7e59c0a6dba64f131c0b1"
        }
      ],
      "title": "vfio/type1: fix cap_migration information leak",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54137",
    "datePublished": "2025-12-24T13:06:52.689Z",
    "dateReserved": "2025-12-24T13:02:52.522Z",
    "dateUpdated": "2025-12-24T13:06:52.689Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54137\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:15.693\",\"lastModified\":\"2025-12-24T13:16:15.693\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 \u003c\u003c __ffs(iommu-\u003epgsize_bitmap);\\n      cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;\\n\\n      return vfio_info_add_capability(caps, \u0026cap_mig.header, sizeof(cap_mig));\\n  }\\n\\nThe structure is then copied to a temporary location on the heap. At this point\\nit\u0027s 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-\u003eid, cap-\u003eversion);\\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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13fd667db999bffb557c5de7adb3c14f1713dd51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1b5feb8497cdb5b9962db2700814bffbc030fb4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad83d83dd891244de0d07678b257dc976db7c132\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbac29a1caa49a34e131394e1f4d924a76d8b0c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd24e2a60af633f157d7e59c0a6dba64f131c0b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6f300ecc196d243c02adeb9ee0c62c677c24bfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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