CVE-2026-64424 (GCVE-0-2026-64424)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-10-30 12:27
VLAI
EPSS
VEX
Title
netpoll: fix a use-after-free on shutdown path
Summary
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.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
38e6bc185d9544dfad1774b3f8902a0b061aea25 , < b67625b85c4b1a3725f4be9c6dd8ce3399d11732
(git)
Affected: 38e6bc185d9544dfad1774b3f8902a0b061aea25 , < 95ecc5b58042f6b6743b589e6588f1cd7ba336aa (git) Affected: 38e6bc185d9544dfad1774b3f8902a0b061aea25 , < a33f37f8d079da7236ed7b7e2aed2a34ab81e7cf (git) Affected: 38e6bc185d9544dfad1774b3f8902a0b061aea25 , < 5ed09a108d93a3b002cc79823d9455b50c4a8be7 (git) Affected: 38e6bc185d9544dfad1774b3f8902a0b061aea25 , < 45f1458a85017a023f138b22ac5c76abd477db42 (git) |
guessed | |
| Linux | Linux |
Affected:
3.6
Unaffected: 0 , < 3.6 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetpoll: fix a use-after-free on shutdown path\n\nThere is a use-after-free error on netpoll, which is clearly detected by\nKASAN.\n\n BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3b/0x80\n Read of size 1 at addr ... by task kworker/9:1\n Workqueue: events queue_process\n Call Trace:\n skb_dequeue+0x1e/0xb0\n queue_process+0x2c/0x600\n process_scheduled_works+0x4b6/0x850\n worker_thread+0x414/0x5a0\n Allocated by task 242:\n __netpoll_setup+0x201/0x4a0\n netpoll_setup+0x249/0x550\n enabled_store+0x32f/0x380\n Freed by task 0:\n kfree+0x1b7/0x540\n rcu_core+0x3f8/0x7a0\n\nThe problem happens when there is a pending TX worker running in\nparallel with the cleanup path.\n\nThis is what happens on netpoll shutdown path:\n\n1) __netpoll_cleanup() is called\n2) set dev-\u003enpinfo to NULL\n3) call_rcu() with rcu_cleanup_netpoll_info()\n 3.1) rcu_cleanup_netpoll_info() tries to cancel all workers with\n cancel_delayed_work(), but doesn\u0027t wait for the worker to finish\n4) and kfree(npinfo);\n\nBecause 3.1) doesn\u0027t really cancel the work, as the comment says \"we\ncan\u0027t call cancel_delayed_work_sync here, as we are in softirq\", the TX\nworker can run after 4).\n\nTl;DR: queue_process() is not an RCU reader, it reaches npinfo through\nthe work item via container_of().\n\nUse disable_delayed_work_sync() to ensure the worker is completely\nstopped and prevent any future re-arming attempts. Once npinfo is set\nto NULL, senders will bail out and not queue new work. The disable flag\nensures any in-flight re-arming attempts also fail silently.\n\nIn the future, we can do the cleanup inline here without needing the\nnpinfo-\u003ercu rcu_head, but that is net-next material."
}
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"id": "CVE-2026-64424",
"lastModified": "2026-10-30T13:19:36.340",
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"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "kernel: netpoll: fix a use-after-free on shutdown path",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64424.json",
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.