{
  "cveId": "CVE-2026-98844",
  "url": "https://patchblox.com/security/cve/CVE-2026-98844",
  "summary": "CVE-2026-98844 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-98844, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "netfs: clear post-EOF pagecache when extending a file via write",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netfs: clear post-EOF pagecache when extending a file via write  Fix netfs to erase the contents of a hole created after the EOF by an ordinary write if dirty data has been previously left there by writes through an mmapped region.  Neither the buffered nor the unbuffered/DIO write path clears that stale pagecache.  Zero the tail of the folio straddling the EOF before an extending write.  That is the only folio that can hold data written past the EOF through an mmap, as pages wholly beyond the EOF can\u0027t be faulted in. The folio is zeroed rather than dropped so a concurrent extending write can\u0027t lose data.  Both write paths downgrade the i_rwsem to shared, so extending writes can run concurrently and the i_size read by the caller may be stale by the time the folio is locked.  Re-read i_size under the folio lock and clamp the zeroed range up to it, so a racing write that already put data into the folio isn\u0027t clobbered.  Wait for any writeback on the folio to finish before zeroing it so that the pagecache isn\u0027t modified while it may still be read by the transport during transmission.  Honour IOCB_NOWAIT by returning -EAGAIN rather than blocking on the folio lock, on writeback, or in folio_mkclean()\u0027s rmap walk when the folio is mapped.  truncate_pagecache() can\u0027t be used here: it must be called with the i_rwsem held exclusively, but these write paths only hold it shared, and it would block unconditionally, breaking IOCB_NOWAIT.  Callers that hold i_rwsem exclusively for the whole resize (truncate, setattr, fallocate, clone) exclude any genuine concurrent buffered writer, so staleness can instead be decided from the folio\u0027s dirty state, as pagecache_isize_extended() already does for filesystems that serialise writes against truncate/setattr via a single i_rwsem. Export netfs_clear_stale_post_isize() helper to handle such case.  The helper is required by the CIFS client to fix generic/363.",
  "published": "2026-10-18T16:17:38Z",
  "severity": "important",
  "epss": 0.00156,
  "epssPercentile": 0.04811,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98844",
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  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}