CVE-2022-50747 (GCVE-0-2022-50747)
Vulnerability from cvelistv5
Published
2025-12-24 13:05
Modified
2026-08-05 08:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: hfs: Fix OOB Write in hfs_asc2mac Syzbot reported a OOB Write bug: loop0: detected capacity change from 0 to 64 ================================================================== BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 Write of size 1 at addr ffff88801848314e by task syz-executor391/3632 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28 hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3710 do_filp_open+0x264/0x4f0 fs/namei.c:3740 If in->len is much larger than HFS_NAMELEN(31) which is the maximum length of an HFS filename, a OOB write could occur in hfs_asc2mac(). In that case, when the dst reaches the boundary, the srclen is still greater than 0, which causes a OOB write. Fix this by adding a check on dstlen in while() before writing to dst address.
References
Impacted products
Vendor Product Version
Linux Linux Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
Version: 328b9227865026268261a24a97a578907b280415
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{
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          "programFiles": [
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              "status": "unaffected",
              "version": "6.1.2",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Fix OOB Write in hfs_asc2mac\n\nSyzbot reported a OOB Write bug:\n\nloop0: detected capacity change from 0 to 64\n==================================================================\nBUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0\nfs/hfs/trans.c:133\nWrite of size 1 at addr ffff88801848314e by task syz-executor391/3632\n\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106\n print_address_description+0x74/0x340 mm/kasan/report.c:284\n print_report+0x107/0x1f0 mm/kasan/report.c:395\n kasan_report+0xcd/0x100 mm/kasan/report.c:495\n hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133\n hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28\n hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31\n lookup_open fs/namei.c:3391 [inline]\n open_last_lookups fs/namei.c:3481 [inline]\n path_openat+0x10e6/0x2df0 fs/namei.c:3710\n do_filp_open+0x264/0x4f0 fs/namei.c:3740\n\nIf in-\u003elen is much larger than HFS_NAMELEN(31) which is the maximum\nlength of an HFS filename, a OOB write could occur in hfs_asc2mac(). In\nthat case, when the dst reaches the boundary, the srclen is still\ngreater than 0, which causes a OOB write.\nFix this by adding a check on dstlen in while() before writing to dst\naddress."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The OOB write is reached via local VFS path lookup on a mounted HFS volume (openat \u2192 path_openat \u2192 hfs_lookup \u2192 hfs_cat_build_key \u2192 hfs_asc2mac). HFS has FS_REQUIRES_DEV and no network-facing parser; loop/UDisks mount keeps this Local rather than Physical.\nAC:L - An attacker who can open/creat/rename a pathname longer than HFS_NAMELEN (31) on an HFS mount with iocharset set (nls_io non-NULL, as in the syzbot repro with iocharset=macturkish) deterministically overflows the destination buffer with no race or attacker-uncontrollable condition.\nPR:L - HFS lacks FS_USERNS_MOUNT so raw mount needs CAP_SYS_ADMIN, but UDisks/polkit lets an unprivileged desktop/kiosk user mount removable or loop-backed HFS media, and any local user who can access an already-mounted HFS volume can trigger the bug via ordinary open/lookup.\nUI:N - The attacking local user can mount their own HFS image (with iocharset) via UDisks or use an existing mount and issue open/lookup with a long name themselves; no separate victim action is required.\nS:U - The slab out-of-bounds write corrupts host kernel heap within the same OS security authority; this is ordinary same-host kernel impact, not a VM/IOMMU/sandbox boundary cross.\nC:H - This is a slab out-of-bounds write of attacker-controlled pathname bytes past the 31-byte hfs_name into the kmalloc\u0027d search_key (and beyond the ~78-byte allocation into adjacent slab objects), which is leverageable for information disclosure via heap corruption.\nI:H - The fixed path is an out-of-bounds write (CWE-787) of up to hundreds of attacker-controlled bytes past HFS_NAMELEN during NLS conversion, enabling heap shaping for arbitrary write/control-flow hijack primitives.\nA:H - The slab-out-of-bounds write is a memory-safety violation that reproducibly trips KASAN and can oops/panic under hardened allocators or by corrupting adjacent heap state, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:36.990Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a95b17e4d4cd2d8278559f930b447f8c9c8cff9"
        },
        {
          "url": "https://git.kernel.org/stable/c/cff9fefdfbf5744afbb6d70bff2b49ec2065d23d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7af9cb8cbb81308ce4b06cc7164267faccbf75dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae21b03f904736eb2aa9bd119d2a14e741f1681f"
        },
        {
          "url": "https://git.kernel.org/stable/c/88579c158e026860c61c4192531e8bc42f4bc642"
        },
        {
          "url": "https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b"
        }
      ],
      "title": "hfs: Fix OOB Write in hfs_asc2mac",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50747",
    "datePublished": "2025-12-24T13:05:43.347Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2026-08-05T08:59:36.990Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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