CVE-2022-50747 (GCVE-0-2022-50747)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2025-12-24 13:05
VLAI?
Title
hfs: Fix OOB Write in hfs_asc2mac
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 328b9227865026268261a24a97a578907b280415 , < 8399318b13dc9e0569dee07ba2994098926d4fb2 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 95040de81c629cd8d3c6ab5b50a8bd5088068303 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < ba8f0ca386dd15acf5a93cbac932392c7818eab4 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 6a95b17e4d4cd2d8278559f930b447f8c9c8cff9 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < cff9fefdfbf5744afbb6d70bff2b49ec2065d23d (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 7af9cb8cbb81308ce4b06cc7164267faccbf75dd (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < ae21b03f904736eb2aa9bd119d2a14e741f1681f (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 88579c158e026860c61c4192531e8bc42f4bc642 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < c53ed55cb275344086e32a7080a6b19cb183650b (git)
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    Linux Linux Affected: 2.6.14
Unaffected: 0 , < 2.6.14 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:05:43.347Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b"
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      "title": "hfs: Fix OOB Write in hfs_asc2mac",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50747",
    "datePublished": "2025-12-24T13:05:43.347Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2025-12-24T13:05:43.347Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50747\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:01.410\",\"lastModified\":\"2025-12-24T13:16:01.410\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a95b17e4d4cd2d8278559f930b447f8c9c8cff9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7af9cb8cbb81308ce4b06cc7164267faccbf75dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88579c158e026860c61c4192531e8bc42f4bc642\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae21b03f904736eb2aa9bd119d2a14e741f1681f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cff9fefdfbf5744afbb6d70bff2b49ec2065d23d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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