{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54137", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.522Z", "datePublished": "2025-12-24T13:06:52.689Z", "dateUpdated": "2026-05-11T19:56:12.086Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:56:12.086Z" }, "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 << __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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/vfio/vfio_iommu_type1.c" ], "versions": [ { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "ad83d83dd891244de0d07678b257dc976db7c132", "status": "affected", "versionType": "git" }, { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "13fd667db999bffb557c5de7adb3c14f1713dd51", "status": "affected", "versionType": "git" }, { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "f6f300ecc196d243c02adeb9ee0c62c677c24bfb", "status": "affected", "versionType": "git" }, { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "cbac29a1caa49a34e131394e1f4d924a76d8b0c9", "status": "affected", "versionType": "git" }, { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "1b5feb8497cdb5b9962db2700814bffbc030fb4a", "status": "affected", "versionType": "git" }, { "version": "ad721705d09c62f0d108a6b4f59867ebfd592c90", "lessThan": "cd24e2a60af633f157d7e59c0a6dba64f131c0b1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/vfio/vfio_iommu_type1.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.195", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.132", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.53", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.16", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.3", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.10.195" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.132" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.4.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.5.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6" } ] } ] } ], "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" } } } }