CVE-2025-71117

Block I/O hang via nested queue freezing

Published Jan 14, 2026 · Updated Jan 14, 2026

Improper locking in Linux Kernel 6.11 through 6.18.2 allows local users to hang block I/O by changing queue sysfs settings. The affected store callbacks freeze the request queue while dm-multipath can hold a conflicting lock, leaving each path waiting on the other. Reachability requires dm-multipath with queue_if_no_path and permission to write io_poll_delay, io_timeout, nomerges, read_ahead_kb, or rq_affinity; the bounded consequence is an I/O deadlock.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Kernel 6.11 through 6.18.2 allows local users to hang block I/O by changing queue sysfs settings. The affected store callbacks freeze the request queue while dm-multipath can hold a conflicting lock, leaving each path waiting on the other. Reachability requires dm-multipath with queue_if_no_path and permission to write io_poll_delay, io_timeout, nomerges, read_ahead_kb, or rq_affinity; the bounded consequence is an I/O deadlock.

The record

CVE
CVE-2025-71117
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 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=6.11
  2. Affected versionversion=af2814149883e2c1851866ea2afcd8eadc040f79 <3997b3147c7b68b0308378fa95a766015f8ceb1c
  3. Affected versionversion=af2814149883e2c1851866ea2afcd8eadc040f79 <935a20d1bebf6236076785fac3ff81e3931834e9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=af2814149883e2c1851866ea2afcd8eadc040f79 <3997b3147c7b68b0308378fa95a766015f8ceb1c; version=af2814149883e2c1851866ea2afcd8eadc040f79 <935a20d1bebf6236076785fac3ff81e3931834e9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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