{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64067",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64067"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "netfs: Fix missing barriers when accessing stream->subrequests locklessly",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing barriers when accessing stream->subrequests locklessly\n\nThe list of subrequests attached to stream->subrequests is accessed without\nlocks by netfs_collect_read_results() and netfs_collect_write_results(),\nand then they access subreq->flags without taking a barrier after getting\nthe subreq pointer from the list.  Relatedly, the functions that build the\nlist don't use any sort of write barrier when constructing the list to make\nsure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if\nno lock is taken.\n\nFix this by:\n\n (1) Add a new list_add_tail_release() function that uses a release barrier\n     to set the pointer to the new member of the list.\n\n (2) Add a new list_first_entry_or_null_acquire() function that uses an\n     acquire barrier to read the pointer to the first member in a list (or\n     return NULL).\n\n (3) Use list_add_tail_release() when adding a subreq to ->subrequests.\n\n (4) Use list_first_entry_or_null_acquire() when initially accessing the\n     front of the list (when an item is removed, the pointer to the new\n     front iterm is obtained under the same lock).",
  "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-2026-64067"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d"
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  "database_specific": {
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    "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 in the netfs client library used by CIFS/SMB, Ceph, 9p, AFS, and NFS clients; a remote file server controls when read/write completions arrive over the network and can time responses to hit the lockless subrequest list race during collection.\nAC:L - The attacker controls both sides of the concurrency (issuing concurrent reads/writes and timing remote completions); on weakly-ordered architectures the missing barriers can cause deterministic misordering without relying on rare external conditions.\nPR:N - A malicious or compromised remote SMB/Ceph/NFS server needs no local privileges on the victim; exploitation only requires the victim system to perform I/O against an already-mounted network filesystem share.\nUI:N - On servers and enterprise systems with persistent fstab/autofs mounts, automated processes (writeback, readahead, backup daemons) trigger netfs I/O without live end-user action at exploit time.\nS:U - Impact is kernel memory corruption and privilege escalation within the same kernel security boundary; this is not a VM escape or cross-authority boundary bypass.\nC:H - Premature removal and freeing of in-flight subrequests is a use-after-free; the collector may read freed `netfs_io_subrequest` memory and stale counters, enabling arbitrary kernel memory disclosure.\nI:H - The UAF and concurrent access to subrequest fields while I/O handlers still run can corrupt heap metadata and subrequest state, providing a path to arbitrary kernel writes or code execution.\nA:H - Freeing active subrequests while SMB/Ceph completion handlers still reference them can cause kernel oops, BUG, or panic from use-after-free and list corruption."
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}