{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64066",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64066"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "netfs: Fix netfs_read_to_pagecache() to pause on subreq failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix netfs_read_to_pagecache() to pause on subreq failure\n\nFix netfs_read_to_pagecache() so that it pauses the generation of new\nsubrequests if an already-issued subrequest fails.",
  "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-2026-64066"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8"
    },
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      "url": "https://git.kernel.org/stable/c/0256e79ce42101ad036edd4205bccca621ea0927"
    },
    {
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      "url": "https://git.kernel.org/stable/c/8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is hit when processing failed network filesystem read completions from remote SMB/NFS/Ceph/9p servers; a malicious or compromised server can trigger mid-read I/O errors over the network during buffered readahead without local kernel access.\nAC:L - An attacker controlling the remote server can reliably cause read failures during large multi-subrequest readahead, and controls the timing of async completions that race the issuer thread; no uncontrollable conditions are required.\nPR:N - The attacker operates as a remote malicious network filesystem server and needs no local privileges on the victim; any user with read access to an already-mounted share can trigger the vulnerable path via normal file reads.\nUI:N - Exploitation requires only routine file access on pre-mounted enterprise NAS/CIFS home directories or auto-mounted virtio-fs/9p shares, with no additional victim action beyond normal reads.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a VM escape or cross-authority boundary bypass.\nC:H - Concurrent issuer/collector manipulation of rolling_buffer folio_queues after subrequest failure can cause use-after-free and out-of-bounds access on kernel heap objects, enabling arbitrary memory disclosure.\nI:H - The race allows continued I/O and buffer advancement after failure handling has abandoned regions, corrupting pagecache folio state and heap metadata in ways that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The synchronization bug causes kernel memory corruption that can trigger oops, BUG, or panic; even without full exploitation, repeated triggering causes system crashes."
    }
  }
}