CVE-2026-74727Network attack vector

Kernel memory corruption via rehashed OVPN peers

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in Linux kernel ovpn 6.16 through affected release lines allows remote attackers to corrupt kernel memory through a peer-removal race. ovpn_nl_peer_set_doit() and the float path rehash a peer after concurrent removal, leaving freed embedded hash entries reachable. Peer deletion, keepalive expiry, or socket teardown must win the locking race; resulting memory corruption can crash the system or enable arbitrary code execution.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel ovpn 6.16 through affected release lines allows remote attackers to corrupt kernel memory through a peer-removal race. ovpn_nl_peer_set_doit() and the float path rehash a peer after concurrent removal, leaving freed embedded hash entries reachable. Peer deletion, keepalive expiry, or socket teardown must win the locking race; resulting memory corruption can crash the system or enable arbitrary code execution.

The record

CVE
CVE-2026-74727
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, CWE-825, CWE-362, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1d36a36f6d5347360ef9681a05f6166683bafd1d <33ec10567fe14456063daf549fdf1a4f53448e4c
  2. Affected versionversion=1d36a36f6d5347360ef9681a05f6166683bafd1d <66745480298775f188b2f5ad266643e85a90f73b
  3. Affected versionversion=1d36a36f6d5347360ef9681a05f6166683bafd1d <d20c181088984b6eaa8d7fe7cb5ab3510988df59
  4. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1d36a36f6d5347360ef9681a05f6166683bafd1d <33ec10567fe14456063daf549fdf1a4f53448e4c; version=1d36a36f6d5347360ef9681a05f6166683bafd1d <66745480298775f188b2f5ad266643e85a90f73b; version=1d36a36f6d5347360ef9681a05f6166683bafd1d <d20c181088984b6eaa8d7fe7cb5ab3510988df59; version=6.16

Published CVSS scores

9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
CWE-825Expired Pointer Dereference
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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