{
  "cveId": "CVE-2026-43292",
  "url": "https://patchblox.com/security/cve/CVE-2026-43292",
  "summary": "CVE-2026-43292 is fixed in 80 products on 1 platform, first by ALAS2023-2026-1543, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mm/vmalloc: prevent RCU stalls in kasan_release_vmalloc_node",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/vmalloc: prevent RCU stalls in kasan_release_vmalloc_node  When CONFIG_PAGE_OWNER is enabled, freeing KASAN shadow pages during vmalloc cleanup triggers expensive stack unwinding that acquires RCU read locks.  Processing a large purge_list without rescheduling can cause the task to hold CPU for extended periods (10\u002B seconds), leading to RCU stalls and potential OOM conditions.  The issue manifests in purge_vmap_node() -\u003E kasan_release_vmalloc_node() where iterating through hundreds or thousands of vmap_area entries and freeing their associated shadow pages causes:    rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:   rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6229/1:b..l   ...   task:kworker/0:17 state:R running task stack:28840 pid:6229   ...   kasan_release_vmalloc_node\u002B0x1ba/0xad0 mm/vmalloc.c:2299   purge_vmap_node\u002B0x1ba/0xad0 mm/vmalloc.c:2299  Each call to kasan_release_vmalloc() can free many pages, and with page_owner tracking, each free triggers save_stack() which performs stack unwinding under RCU read lock.  Without yielding, this creates an unbounded RCU critical section.  Add periodic cond_resched() calls within the loop to allow: - RCU grace periods to complete - Other tasks to run - Scheduler to preempt when needed  The fix uses need_resched() for immediate response under load, with a batch count of 32 as a guaranteed upper bound to prevent worst-case stalls even under light load.",
  "published": "2026-04-07T09:00:00Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00122,
  "epssPercentile": 0.0198,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43292",
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    }
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}