{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64216",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64216"
  ],
  "published": "2026-07-24T15:23:26Z",
  "summary": "netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()\n\nnetfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it\nis wanting to unlock and compares that to rreq->no_unlock_folio so that it\ndoesn't unlock a folio being read for netfs_perform_write() or\nnetfs_write_begin().\n\nHowever, given that netfs_unlock_abandoned_read_pages() is called _after_\nNETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to\ndereference is the one specified by ->no_unlock_folio as ownership\nimmediately reverts to the caller.\n\nFix this by storing the folio pointer instead and using that rather than\nthe index.  Also fix netfs_unlock_read_folio() where the same applies.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64216"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d4ae8dba90b89e7bb4d1045d1cb26afbaf13ee5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6080fa3ecfbb4448a3b47368629534c09b6ec750"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3866d015f33aeedf81338dd99154703bef33faef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dbe556972100fabb8e5a1b3d2163831ff07b1e8e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T12:40:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable read-for-write completion is used by network filesystem clients including Ceph, SMB, 9P, and AFS. A malicious filesystem peer can induce failed or malformed reads and control completion timing.\nAC:L - Partial buffered writes and concurrent invalidation can repeatedly trigger the race, with an adjacent bug reproducing approximately 30% of repeated attempts. The attacker can influence completion, reuse, and retry timing.\nPR:N - A malicious filesystem server requires no privileges on the victim client; mount and session credentials belong to the victim.\nUI:N - Once the network filesystem is mounted, ordinary or automated writes can exercise the vulnerable path without further human action.\nS:U - The UAF corrupts resources within the host kernel's existing security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - The stale folio can be freed and reused, and premature unlocking of a replacement page can expose page-cache or kernel contents.\nI:H - If the folio is reused, folio_unlock() can toggle PG_locked on an unrelated page, enabling concurrent memory corruption and potentially code execution.\nA:H - The condition can trigger a VM_BUG_ON_FOLIO kernel crash; incorrect PG_locked state can also cause permanent page-lock waits and system hangs."
    }
  }
}