{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64058",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64058"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "netfs: Fix netfs_read_folio() to wait on writeback",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix netfs_read_folio() to wait on writeback\n\nFix netfs_read_folio() to wait for an ongoing writeback to complete so that\nit can trust the dirty flag and whatever is attached to folio->private\n(folio->private may get cleaned up by the collector before it clears the\nwriteback flag).",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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-2026-64058"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/090a8aa1894b72f5b3fc18dee68d42ad45f4a2c6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f17b9121bb99f88188ec9be2db5da1d561f4c01b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b8271cccdd5e43cc8d738afb8b51f6ad05b1cb4b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ded0c6f1606061148c202825f7e53d711f9f84cf"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in the netfs client page-cache path (`netfs_read_folio()`), reached only through local VFS operations (read/mmap/page fault) on mounted network filesystems (CIFS, Ceph, AFS, 9p, NFS+fscache), not from remote packet handling.\nAC:L - An attacker can reliably trigger the race by concurrently performing streaming writes and reads on the same folio from threads they control, forcing writeback while reads hit the vulnerable dirty-folio path.\nPR:L - Exploitation requires only unprivileged access to read/write files on an already-mounted netfs-backed filesystem; no CAP_SYS_ADMIN, real root, or user-namespace capability is needed.\nUI:N - No victim interaction is required beyond the attacker (or any local process with file access) issuing the concurrent read/write operations that trigger the race.\nS:U - The vulnerability corrupts kernel heap memory during local filesystem I/O in the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries.\nC:H - The race frees `struct netfs_folio` in `folio->private` before writeback completes, creating a use-after-free that can expose or leak kernel heap contents when `netfs_read_gaps()` dereferences stale metadata.\nI:H - UAF on the kmalloc'd `netfs_folio` object can be leveraged for heap manipulation; corrupted `dirty_offset`/`dirty_len` values drive subsequent I/O vector setup and pagecache writes in `netfs_read_gaps()`.\nA:H - Winning the race causes kernel oops/panic via NULL dereference or use-after-free during `netfs_read_gaps()`, and a malicious local user can repeat the trigger to deny availability on shared servers with CIFS/NFS/Ceph mounts."
    }
  }
}