CVE-2025-38571Network attack vector

Remote kernel crash via advanced message iterator

Published Aug 19, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel NFS-over-TLS client allows remote attackers to crash a client by sending a crafted TLS alert. tls_alert_recv reuses an msghdr iterator after the copy path advances its kvec pointer, causing alert handling to dereference invalid state. Exploitation requires an NFS client with NFS over TLS enabled and interrupts the entire kernel; no confidentiality or integrity impact is established.

CVSS severity8.2
High
EPSS probability0.33%
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 the Linux kernel NFS-over-TLS client allows remote attackers to crash a client by sending a crafted TLS alert. tls_alert_recv reuses an msghdr iterator after the copy path advances its kvec pointer, causing alert handling to dereference invalid state. Exploitation requires an NFS client with NFS over TLS enabled and interrupts the entire kernel; no confidentiality or integrity impact is established.

The record

CVE
CVE-2025-38571
Published
Aug 19, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.5
  2. Affected versionversion=dea034b963c8901bdcc3d3880c04f0d75c95112f <3ee397eaaca4fa04db21bb98c8f1d0c6cc525368
  3. Affected versionversion=dea034b963c8901bdcc3d3880c04f0d75c95112f <3feada5baf4dc96e151ff2ca54630e1d274e5458
  4. Affected versionversion=dea034b963c8901bdcc3d3880c04f0d75c95112f <a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95
  5. Affected versionversion=dea034b963c8901bdcc3d3880c04f0d75c95112f <c36b2fbd60e8f9c6f975522130998608880c93be
  6. Affected versionversion=dea034b963c8901bdcc3d3880c04f0d75c95112f <cc5d59081fa26506d02de2127ab822f40d88bc5a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=dea034b963c8901bdcc3d3880c04f0d75c95112f <3ee397eaaca4fa04db21bb98c8f1d0c6cc525368; version=dea034b963c8901bdcc3d3880c04f0d75c95112f <3feada5baf4dc96e151ff2ca54630e1d274e5458; version=dea034b963c8901bdcc3d3880c04f0d75c95112f <a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95; version=dea034b963c8901bdcc3d3880c04f0d75c95112f <c36b2fbd60e8f9c6f975522130998608880c93be; version=dea034b963c8901bdcc3d3880c04f0d75c95112f <cc5d59081fa26506d02de2127ab822f40d88bc5a

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.2Linux CNA via CVE.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
7.5Red HatCVSS: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.

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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

CWE-416Use After Free
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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