{
  "cveId": "CVE-2026-64424",
  "url": "https://patchblox.com/security/cve/CVE-2026-64424",
  "summary": "CVE-2026-64424 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-64424, released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "netpoll: fix a use-after-free on shutdown path",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netpoll: fix a use-after-free on shutdown path  There is a use-after-free error on netpoll, which is clearly detected by KASAN.        BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave\u002B0x3b/0x80       Read of size 1 at addr ... by task kworker/9:1       Workqueue: events queue_process       Call Trace:        skb_dequeue\u002B0x1e/0xb0        queue_process\u002B0x2c/0x600        process_scheduled_works\u002B0x4b6/0x850        worker_thread\u002B0x414/0x5a0       Allocated by task 242:        __netpoll_setup\u002B0x201/0x4a0        netpoll_setup\u002B0x249/0x550        enabled_store\u002B0x32f/0x380       Freed by task 0:        kfree\u002B0x1b7/0x540        rcu_core\u002B0x3f8/0x7a0  The problem happens when there is a pending TX worker running in parallel with the cleanup path.  This is what happens on netpoll shutdown path:  1) __netpoll_cleanup() is called 2) set dev-\u003Enpinfo to NULL 3) call_rcu() with rcu_cleanup_netpoll_info()   3.1) rcu_cleanup_netpoll_info() tries to cancel all workers with        cancel_delayed_work(), but doesn\u0027t wait for the worker to finish 4) and kfree(npinfo);  Because 3.1) doesn\u0027t really cancel the work, as the comment says \u0022we can\u0027t call cancel_delayed_work_sync here, as we are in softirq\u0022, the TX worker can run after 4).  Tl;DR: queue_process() is not an RCU reader, it reaches npinfo through the work item via container_of().  Use disable_delayed_work_sync() to ensure the worker is completely stopped and prevent any future re-arming attempts. Once npinfo is set to NULL, senders will bail out and not queue new work. The disable flag ensures any in-flight re-arming attempts also fail silently.  In the future, we can do the cleanup inline here without needing the npinfo-\u003Ercu rcu_head, but that is net-next material.",
  "published": "2026-07-25T10:17:26Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00125,
  "epssPercentile": 0.0222,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64424",
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