CVE-2025-38525Network attack vector

Remote service interruption via interrupt-state misuse

Published Aug 16, 2025 · Updated Aug 10, 2026

Incorrect interrupt-state handling in Linux allows remote attackers to interrupt service through an incoming RxRPC call. The rxrpc_new_incoming_call path invokes rxrpc_assess_MTU_size while interrupts are disabled, and its IP-layer route lookup calls local_bh_enable under that incompatible state. Reachability requires an incoming RxRPC call and a configuration that emits the interrupt-state warning; published assessments report availability impact only.

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

Incorrect interrupt-state handling in Linux allows remote attackers to interrupt service through an incoming RxRPC call. The rxrpc_new_incoming_call path invokes rxrpc_assess_MTU_size while interrupts are disabled, and its IP-layer route lookup calls local_bh_enable under that incompatible state. Reachability requires an incoming RxRPC call and a configuration that emits the interrupt-state warning; published assessments report availability impact only.

The record

CVE
CVE-2025-38525
Published
Aug 16, 2025
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=09c59a82298f424f6212c67fbea531853e88ce6c <8ac0b3baa7d8f732bd9e5cbf1d8b57e4802c6b36
  2. Affected versionversion=6.12.101 <6.12.103
  3. Affected versionversion=6.14
  4. Affected versionversion=6.6.148 <6.6.151
  5. Affected versionversion=77433b730970ca6e51d03016e830d8ab1b22685a <d94b82d452ca27a200cd67660dc48476386651d8
  6. Affected versionversion=a2ea9a9072607c2fd6442bd1ffb4dbdbf882aed7 <2029f21f10dedb88c0f86abffcf8d6c21dcf6040
  7. Affected versionversion=a2ea9a9072607c2fd6442bd1ffb4dbdbf882aed7 <e4d2878369d590bf8455e3678a644e503172eafa

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=09c59a82298f424f6212c67fbea531853e88ce6c <8ac0b3baa7d8f732bd9e5cbf1d8b57e4802c6b36; version=6.12.101 <6.12.103; version=6.14; version=6.6.148 <6.6.151; version=77433b730970ca6e51d03016e830d8ab1b22685a <d94b82d452ca27a200cd67660dc48476386651d8; version=a2ea9a9072607c2fd6442bd1ffb4dbdbf882aed7 <2029f21f10dedb88c0f86abffcf8d6c21dcf6040; version=a2ea9a9072607c2fd6442bd1ffb4dbdbf882aed7 <e4d2878369d590bf8455e3678a644e503172eafa

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.5Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.9UbuntuCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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

T1499Endpoint Denial of Service

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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