CVE-2026-74750Network attack vector

Remote denial of service via sleeping RCU teardown

Published Aug 26, 2026 · Updated Aug 27, 2026

Denial of service in the Linux kernel ovpn module 6.16 through 7.1.9 allows remote attackers to crash VPN gateway hosts. The key-slot kref release path calls crypto_free_aead from an RCU callback even though asynchronous or hardware AEAD teardown can sleep, violating atomic-context rules. An operational ovpn tunnel with peers and keys is required; a remote TCP disconnect or keepalive expiry can trigger an oops, RCU stall, or kernel panic.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel ovpn module 6.16 through 7.1.9 allows remote attackers to crash VPN gateway hosts. The key-slot kref release path calls crypto_free_aead from an RCU callback even though asynchronous or hardware AEAD teardown can sleep, violating atomic-context rules. An operational ovpn tunnel with peers and keys is required; a remote TCP disconnect or keepalive expiry can trigger an oops, RCU stall, or kernel panic.

The record

CVE
CVE-2026-74750
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-663, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=6.16
  2. Affected versionversion=8534731dbf2d52a539b94defd06d2a8d3514aacb <0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3
  3. Affected versionversion=8534731dbf2d52a539b94defd06d2a8d3514aacb <2da3dfa1ddfe55a065f484750c83660e3bd4ac00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=8534731dbf2d52a539b94defd06d2a8d3514aacb <0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3; version=8534731dbf2d52a539b94defd06d2a8d3514aacb <2da3dfa1ddfe55a065f484750c83660e3bd4ac00

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-663Use of a Non-reentrant Function in a Concurrent Context
T1499.004Application 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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