GHSA-4HFR-M4M2-94FF

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-06 12:30
VLAI?
Details

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

md/bitmap: fix GPF in write_page caused by resize race

A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod]

This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over bitmap->storage.filemap without locking, while the resize path frees that storage via md_bitmap_file_unmap(). quiesce() does not stop the md thread, allowing concurrent access to freed pages.

Fix by holding mddev->bitmap_info.mutex during the bitmap update.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43163"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/bitmap: fix GPF in write_page caused by resize race\n\nA General Protection Fault occurs in write_page() during array resize:\nRIP: 0010:write_page+0x22b/0x3c0 [md_mod]\n\nThis is a use-after-free race between bitmap_daemon_work() and\n__bitmap_resize(). The daemon iterates over `bitmap-\u003estorage.filemap`\nwithout locking, while the resize path frees that storage via\nmd_bitmap_file_unmap(). `quiesce()` does not stop the md thread,\nallowing concurrent access to freed pages.\n\nFix by holding `mddev-\u003ebitmap_info.mutex` during the bitmap update.",
  "id": "GHSA-4hfr-m4m2-94ff",
  "modified": "2026-05-06T12:30:31Z",
  "published": "2026-05-06T12:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43163"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/140cc839fbeb1ddb33a8da8811b716d88d3905b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46ef85f854dfa9d5226b3c1c46493d79556c9589"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f73c8b33df9a605a591eab72d43a969600c1f8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a437e3bf30e32846079e470c1ba5ee790bccdf89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3af62411e19752c663fe4f424dbf49d95a4cc7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d92b8fac294b5f915c50e65ce4ae2262e53614ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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