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CVE-2026-64424netpoll: 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+0x3b/0x80 Read of size 1 at addr ... by task kworker/9:1 Workqueue: events queue_process Call Trace: skb_dequeue+0x1e/0xb0 queue_process+0x2c/0x600 process_scheduled_works+0x4b6/0x850 worker_thread+0x414/0x5a0 Allocated by task 242: __netpoll_setup+0x201/0x4a0 netpoll_setup+0x249/0x550 enabled_store+0x32f/0x380 Freed by task 0: kfree+0x1b7/0x540 rcu_core+0x3f8/0x7a0 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->npinfo 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't wait for the worker to finish 4) and kfree(npinfo); Because 3.1) doesn't really cancel the work, as the comment says "we can't call cancel_delayed_work_sync here, as we are in softirq", 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->rcu rcu_head, but that is net-next material.

Timeline

  1. ID reserved

    By Linux

  2. · 6 days later

    Published

  3. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-64424, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.13% · top 98% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected 38e6bc185d9544dfad1774b3f8902a0b061aea25 – < b67625b85c4b1a3725f4be9c6dd8ce3399d11732
    • affected 38e6bc185d9544dfad1774b3f8902a0b061aea25 – < 95ecc5b58042f6b6743b589e6588f1cd7ba336aa
    • affected 38e6bc185d9544dfad1774b3f8902a0b061aea25 – < a33f37f8d079da7236ed7b7e2aed2a34ab81e7cf
    • affected 38e6bc185d9544dfad1774b3f8902a0b061aea25 – < 5ed09a108d93a3b002cc79823d9455b50c4a8be7
    • affected 38e6bc185d9544dfad1774b3f8902a0b061aea25 – < 45f1458a85017a023f138b22ac5c76abd477db42

  • Linux · Linux

    • affected 3.6
    • unaffected < 3.6
    • unaffected 6.1.191 – ≤ 6.1.*
    • unaffected 6.12.96 – ≤ 6.12.*
    • unaffected 6.18.39 – ≤ 6.18.*
    • unaffected 7.1.4 – ≤ 7.1.*
    • unaffected 7.2 – ≤ *

References

References5

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .