{
  "cveId": "CVE-2026-64477",
  "url": "https://patchblox.com/security/cve/CVE-2026-64477",
  "summary": "CVE-2026-64477 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-64477, released July 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  x86,fs/resctrl: Prevent out-of-bounds access whi...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  x86,fs/resctrl: Prevent out-of-bounds access while offlining CPU when SNC enabled  The architecture updates the cpu_mask in a domain\u0027s header to track which online CPUs are associated with the domain. When this mask becomes empty the architecture initiates offline of the domain that includes calling on resctrl fs to offline the domain. If it is a monitoring domain in which LLC occupancy is tracked resctrl fs forces the limbo handler to clear all busy RMID state associated with the domain.  The limbo handler always reads the current event value associated with a busy RMID irrespective of it being checked as part of regular \u0022is it still busy\u0022 check or whether it will be forced released anyway. When reading an RMID on a system with SNC enabled the \u0022logical RMID\u0022 is converted to the \u0022physical RMID\u0022 and this conversion requires the NUMA node ID of the resctrl monitoring domain that is in turn determined by querying the NUMA node ID of any CPU belonging to the monitoring domain.  When the monitoring domain is going offline its cpu_mask is empty causing the NUMA node ID query via cpu_to_node() to be done with \u0022nr_cpu_ids\u0022 as argument resulting in an out-of-bounds access.  Refactor the limbo handler to skip reading the RMID when the RMID will just be forced to no longer be dirty in the domain anyway. Add a safety check to the architecture\u0027s RMID reader to protect against this scenario.",
  "published": "2026-07-25T10:17:33Z",
  "severity": "IMPORTANT",
  "cvss": 5.5,
  "epss": 0.00176,
  "epssPercentile": 0.07147,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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