{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72364",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72364"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "netfs: Fix writeback error handling",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix writeback error handling\n\nFix the error handling in writeback_iter() loop.  If an error occurs,\nwriteback_iter() needs to be called again with *error set to the error so\nthat it can clean up iteration state.  Further, the current folio needs\nunlocking and redirtying.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72364"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb39ffd3cc5422887fd118668ff45ebfdbc83302"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1bb33d959aabcde07d724b5eb9992462e91fa79a"
    },
    {
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      "url": "https://git.kernel.org/stable/c/89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in client-side netfs writeback reached only via local VFS writeback (do_writepages -> netfs_writepages) on CIFS, 9p, and AFS mounts after local writes/mmaps dirty pagecache; it is not in ksmbd/nfsd or other packet-receive paths.\nAC:L - An attacker can reliably trigger -ENOMEM during writeback by exhausting the 100-entry folio_queue mempool or system memory while dirtying many pages on a netfs mount, then forcing writeback via sync/fsync, close, or reclaim.\nPR:L - Exploitation requires a local process with write access to files on a netfs-backed mount (typical unprivileged CIFS/9p/AFS user); no real-root or init-namespace-only capability is needed beyond normal filesystem permissions.\nUI:N - No victim interaction is required beyond normal background writeback or attacker-initiated sync/memory pressure; exploitation does not depend on a victim opening a file or mounting a share at attack time.\nS:U - Impact is confined to the kernel pagecache and netfs writeback state on the affected host; it does not cross VM, container, or IOMMU security boundaries into another authority.\nC:N - The flaw mishandles folio locks and dirty state causing data loss or hangs; it does not expose kernel memory, leak pointers, or provide an out-of-bounds or use-after-free read primitive.\nI:H - On -ENOMEM at writeback start the vulnerable path calls netfs_kill_dirty_pages(), which clears dirty folios without uploading them, silently destroying arbitrary unsaved buffered data on network filesystem mounts.\nA:H - Breaking out of the writeback_iter loop on error leaves folios locked and writeback state uncleared, causing indefinite blocking of processes accessing those pages and stalling future writeback on affected files."
    }
  }
}