GHSA-F88F-286J-XF6G

Vulnerability from github – Published: 2025-10-22 15:31 – Updated: 2026-08-04 12:34
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

fs: jfs: fix shift-out-of-bounds in dbAllocAG

Syzbot found a crash : UBSAN: shift-out-of-bounds in dbAllocAG. The underlying bug is the missing check of bmp->db_agl2size. The field can be greater than 64 and trigger the shift-out-of-bounds.

Fix this bug by adding a check of bmp->db_agl2size in dbMount since this field is used in many following functions. The upper bound for this field is L2MAXL2SIZE - L2MAXAG, thanks for the help of Dave Kleikamp. Note that, for maintenance, I reorganized error handling code of dbMount.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-50567"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-22T14:15:41Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: jfs: fix shift-out-of-bounds in dbAllocAG\n\nSyzbot found a crash : UBSAN: shift-out-of-bounds in dbAllocAG. The\nunderlying bug is the missing check of bmp-\u003edb_agl2size. The field can\nbe greater than 64 and trigger the shift-out-of-bounds.\n\nFix this bug by adding a check of bmp-\u003edb_agl2size in dbMount since this\nfield is used in many following functions. The upper bound for this\nfield is L2MAXL2SIZE - L2MAXAG, thanks for the help of Dave Kleikamp.\nNote that, for maintenance, I reorganized error handling code of dbMount.",
  "id": "GHSA-f88f-286j-xf6g",
  "modified": "2026-08-04T12:34:37Z",
  "published": "2025-10-22T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50567"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0536f76a2bca83d1a3740517ba22cc93a44b3099"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c575c8905f7a8b32d5611b91856b69bac2a5bf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3115313cf03113e87c87adee18ee49a20bbdb9ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/359616ce587e524107730504891afa4b1a8be58c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e997e4ce8ae7ab89d72334120f6aee49c5bbdbd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67973caae78e21ee46a7281aaa8ca364eb9c444f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/898f706695682b9954f280d95e49fa86ffa55d08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3b486946a4e62c7ef6023f7d9c1d049051384ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eea87acb6027be3dd4d3c57186bb22800d57fdda"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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