VulnerabilityPublished 25 Jul 2026Updated 30 Oct 2026

CVE-2026-64424: Linux kernel · netpoll: fix a use-after-free on shutdown path

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in b67625b85c4b1a3725f4be9c6dd8ce3399d11732 : patch Linux kernel soon.

Data as of 30 Oct 2026, 13:33 UTC

Severity

High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Patch: Available – fixed in b67625b85c4b1a3725f4be9c6dd8ce3399d11732, a33f37f8d079da7236ed7b7e2aed2a34ab81e7cf, 95ecc5b58042f6b6743b589e6588f1cd7ba336aa +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 38e6bc185d9544dfad1774b3f8902a0b061aea25, < b67625b85c4b1a3725f4be9c6dd8ce3399d11732	Fixed in b67625b85c4b1a3725f4be9c6dd8ce3399d11732
LinuxLinux	Affected ≥ 38e6bc185d9544dfad1774b3f8902a0b061aea25, < a33f37f8d079da7236ed7b7e2aed2a34ab81e7cf	Fixed in a33f37f8d079da7236ed7b7e2aed2a34ab81e7cf
LinuxLinux	Affected ≥ 38e6bc185d9544dfad1774b3f8902a0b061aea25, < 95ecc5b58042f6b6743b589e6588f1cd7ba336aa	Fixed in 95ecc5b58042f6b6743b589e6588f1cd7ba336aa
LinuxLinux	Affected ≥ 38e6bc185d9544dfad1774b3f8902a0b061aea25, < 45f1458a85017a023f138b22ac5c76abd477db42	Fixed in 45f1458a85017a023f138b22ac5c76abd477db42
LinuxLinux	Affected ≥ 38e6bc185d9544dfad1774b3f8902a0b061aea25, < 5ed09a108d93a3b002cc79823d9455b50c4a8be7	Fixed in 5ed09a108d93a3b002cc79823d9455b50c4a8be7
LinuxLinux	Affected =3.6	Fixed in–

AI-suggested

A fix is available in the Linux kernel as indicated by multiple fixed commit versions. Users should update to a kernel version that includes these fixes. No additional mitigation is required once patched.

Description

CVE-2026-64424 is a use-after-free vulnerability in the Linux kernel's netpoll subsystem affecting version 3.6. The flaw occurs during the shutdown path when a pending TX worker runs concurrently with the cleanup process, leading to a use-after-free detected by KASAN. The issue arises because cancel_delayed_work() does not wait for the worker to finish, allowing the worker to access freed memory. The fix involves using disable_delayed_work_sync() to ensure the worker is fully stopped before freeing memory.

Impact

The vulnerability can lead to kernel memory corruption due to use-after-free, which may cause system instability or crashes. There is no indication of known exploitation in the wild. The impact is limited to affected kernel versions running netpoll with the described shutdown sequence.

Summary

This vulnerability in the Linux kernel netpoll subsystem involves a use-after-free error on the shutdown path. Specifically, during netpoll cleanup, __netpoll_cleanup() sets dev->npinfo to NULL and calls call_rcu() with rcu_cleanup_netpoll_info(), which attempts to cancel delayed work without waiting for completion due to softirq context restrictions. Consequently, the TX worker can still run after npinfo is freed, causing a use-after-free. The fix replaces cancel_delayed_work() with disable_delayed_work_sync() to guarantee the worker is stopped and prevent re-arming, thus avoiding access to freed memory.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Oct 2026, 13:33 UTC

Technical details

References

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