GHSA-6FWF-F783-HFQC

Vulnerability from github – Published: 2025-12-24 15:30 – Updated: 2025-12-24 15:30
VLAI?
Details

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: __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.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50747"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T13:16:01Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-6fwf-f783-hfqc",
  "modified": "2025-12-24T15:30:33Z",
  "published": "2025-12-24T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50747"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a95b17e4d4cd2d8278559f930b447f8c9c8cff9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7af9cb8cbb81308ce4b06cc7164267faccbf75dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88579c158e026860c61c4192531e8bc42f4bc642"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae21b03f904736eb2aa9bd119d2a14e741f1681f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cff9fefdfbf5744afbb6d70bff2b49ec2065d23d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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