{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "77ff465799c60294e248000cd22ae8171da3304c"
            },
            {
              "fixed": "3674d8a8dadd03a447dd21069d4dacfc3399b63b"
            },
            {
              "fixed": "645996efc2ae391246d595832aaa6f9d3cc338c7"
            },
            {
              "fixed": "fc658c083904427abbf8f18280d517ee2668677c"
            },
            {
              "fixed": "fae05b2314b147a78fbed1dc4c645d9a66313758"
            },
            {
              "fixed": "3ec459c8810e658401be428d3168eacfc380bdd0"
            },
            {
              "fixed": "8ba7b7c1dad1f6503c541778f31b33f7f62eb966"
            },
            {
              "fixed": "c5402fb5f71f1a725f1e55d9c6799c0c7bec308f"
            },
            {
              "fixed": "2505a981114dcb715f8977b8433f7540854851d8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49554.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nzsmalloc: fix races between asynchronous zspage free and page migration\n\nThe asynchronous zspage free worker tries to lock a zspage's entire page\nlist without defending against page migration.  Since pages which haven't\nyet been locked can concurrently migrate off the zspage page list while\nlock_zspage() churns away, lock_zspage() can suffer from a few different\nlethal races.\n\nIt can lock a page which no longer belongs to the zspage and unsafely\ndereference page_private(), it can unsafely dereference a torn pointer to\nthe next page (since there's a data race), and it can observe a spurious\nNULL pointer to the next page and thus not lock all of the zspage's pages\n(since a single page migration will reconstruct the entire page list, and\ncreate_page_chain() unconditionally zeroes out each list pointer in the\nprocess).\n\nFix the races by using migrate_read_lock() in lock_zspage() to synchronize\nwith page migration.",
  "id": "CVE-2022-49554",
  "modified": "2026-04-01T23:08:47.779763581Z",
  "published": "2025-02-26T02:14:02.649Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49554.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49554"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "zsmalloc: fix races between asynchronous zspage free and page migration"
}