CVE-2025-39682Network attack vector

Remote code execution via kTLS record mishandling

Published Sep 5, 2025 · Updated Sep 5, 2025

Memory corruption in affected Linux kernel releases allows remote attackers to execute code via crafted records on a kTLS receive socket. When recvmsg() starts with a zero-length record from rx_list after zero-copy decryption, the receive path requeues an anchor whose backing TCP buffers have been released, causing later access to freed kernel memory. Reachability requires an established kTLS receive socket and a malicious TLS peer; exploitation exposes kernel memory, corrupts kernel state, or crashes the host.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in affected Linux kernel releases allows remote attackers to execute code via crafted records on a kTLS receive socket. When recvmsg() starts with a zero-length record from rx_list after zero-copy decryption, the receive path requeues an anchor whose backing TCP buffers have been released, causing later access to freed kernel memory. Reachability requires an established kTLS receive socket and a malicious TLS peer; exploitation exposes kernel memory, corrupts kernel state, or crashes the host.

The record

CVE
CVE-2025-39682
Published
Sep 5, 2025
Updated
Sep 5, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 2025Record 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=6.0
  2. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <2902c3ebcca52ca845c03182000e8d71d3a5196f
  3. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e
  4. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <3439c15ae91a517cf3c650ea15a8987699416ad9
  5. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <62708b9452f8eb77513115b17c4f8d1a22ebf843
  6. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <2902c3ebcca52ca845c03182000e8d71d3a5196f; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <3439c15ae91a517cf3c650ea15a8987699416ad9; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <62708b9452f8eb77513115b17c4f8d1a22ebf843; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

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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

T1190Exploit Public-Facing Application

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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