{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-30T14:20:26.622","vulnerabilities":[{"cve":{"id":"CVE-2023-54137","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-12-24T13:16:15.693","lastModified":"2026-04-15T00:35:42.020","vulnStatus":"Deferred","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 << __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."}],"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"}]}}]}