zsmalloc: fix races between asynchronous zspage free and page migration

{
  "id": "f5f914279316af110402b566ba563cebf62c3e69346b7bf7184f7e93fd84355e",
  "url": "https://osv.dev/vulnerability/CVE-2022-49554",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "zsmalloc: fix races between asynchronous zspage free and page migration",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.",
    "evidence": "osv:CVE-2022-49554",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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      "aliases": [
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          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:41.555475462Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8",
        "https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b",
        "https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0",
        "https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7",
        "https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966",
        "https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f",
        "https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758",
        "https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49554.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49554",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49554.json"
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    "related_cves": [
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        "value": "CVE-2022-49554",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 508848,
  "published_at": "2025-02-26T02:14:02.649+00:00"
}