{
  "cveId": "CVE-2026-90201",
  "url": "https://patchblox.com/security/cve/CVE-2026-90201",
  "summary": "CVE-2026-90201 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-90201, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net: page_pool: fix UAF in __page_pool_release_netmem_dma on xa_cmpxchg race",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: page_pool: fix UAF in __page_pool_release_netmem_dma on xa_cmpxchg race  This bug was discovered while testing the hns3 driver under channel reconfiguration (\u0060ethtool -L\u0060 / \u0060ethtool -G\u0060) with iperf3 traffic on arm64. The race is intermittently triggered when page_pool_destroy() runs page_pool_scrub() concurrently with page return via page_pool_put_netmem() on a different CPU. A WARN in page_pool_clear_pp_info() surfaced the dangling DMA index bits left by the cmpxchg loser, which led to the investigation.  page_pool_scrub() iterates pool-\u003Edma_mapped via xa_for_each() with no page ref held. __page_pool_release_netmem_dma() currently reads and writes netmem fields (dma_addr, DMA index bits in pp_magic) after xa_cmpxchg() returns. The unref path calls put_page() unconditionally regardless of the cmpxchg outcome; when it loses the cmpxchg, it still frees the page before the scrub winner finishes these netmem accesses, so scrub touches a freed page -- a Use-After-Free.  Fix this by splitting the DMA release into two functions:  1. __page_pool_unmap_netmem_dma() caches dma_addr before xa_cmpxchg(),    does the cmpxchg to remove the DMA mapping, and calls dma_unmap on    the cached address. It never touches netmem fields after the cmpxchg,    making it safe for the scrub path which holds no page ref.  2. __page_pool_release_netmem_dma() wraps the above and additionally    clears dma_addr and DMA index bits in netmem fields. This is safe    only when the caller holds a page ref, so it is used by the return    path (page_pool_return_netmem).  The scrub path calls __page_pool_unmap_netmem_dma() directly; the return path calls __page_pool_release_netmem_dma().",
  "published": "2026-09-17T17:17:15Z",
  "severity": "IMPORTANT",
  "cvss": 7.8,
  "epss": 0.00206,
  "epssPercentile": 0.10632,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90201",
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    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}