{
  "cveId": "CVE-2026-98920",
  "url": "https://patchblox.com/security/cve/CVE-2026-98920",
  "summary": "CVE-2026-98920 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98920 (version 7.2.9-1), released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix missing alloc tagging of direct mempo...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix missing alloc tagging of direct mempool allocations  Commit 1d78d56c43ef (\u0022netfs: Fix folio_queue ENOMEM in writeback by adding a mempool\u0022) added a mempool for the folio_queues and made the request, subrequest and folio_queue allocations distinguish between writeback and everything else.  Writeback is part of memory reclaim and must not fail due to ENOMEM, so it allocates under GFP_NOFS through mempool_alloc(), which may dip into the pool\u0027s reserve and, if that runs empty, wait for elements to be returned.  The GFP_KERNEL paths, which can return -ENOMEM to their callers, invoke the pool\u0027s -\u003Ealloc() callback directly instead.  The direct call, however, skips the alloc_hooks() wrapper that the mempool_alloc() macro provides.  The pool callbacks, mempool_alloc_slab() and mempool_kmalloc(), call kmem_cache_alloc_noprof() and kmalloc_noprof() and rely on current-\u003Ealloc_tag having been set by the caller.  With CONFIG_MEM_ALLOC_PROFILING_DEBUG=y this leads to      current-\u003Ealloc_tag not set     WARNING: ./include/linux/alloc_tag.h:161 at __alloc_tagging_slab_alloc_hook     alloc_tag was not set     WARNING: ./include/linux/alloc_tag.h:166 at __alloc_tagging_slab_free_hook  at allocation and free time respectively, as reported when reading files on a CIFS mount.  The allocations are also missing from /proc/allocinfo.  Wrap the direct -\u003Ealloc() invocations in alloc_hooks() with a new mempool_alloc_noreserve() helper in include/linux/mempool.h, next to the other alloc_hooks()-wrapped macros such as mempool_alloc().  The GFP_KERNEL paths keep their failable allocation semantics, they just get tagged now.",
  "published": "2026-10-23T13:17:12Z",
  "severity": "",
  "epss": 0.00166,
  "epssPercentile": 0.05939,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98920",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98920",
      "released": "2026-10-24T13:25:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}