CVE-2025-71135

Local system crash via NULL RAID5 configuration

Published Jan 14, 2026 · Updated Jan 14, 2026

NULL pointer dereference in Linux Kernel 6.13 allows local users to crash the system through the RAID5 group_thread_cnt setting. raid5_store_group_thread_cnt detects a NULL mddev->private value but still calls raid5_quiesce, which reloads and dereferences that value. Reachability requires local low-privilege access and an md device without a private RAID5 configuration; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel 6.13 allows local users to crash the system through the RAID5 group_thread_cnt setting. raid5_store_group_thread_cnt detects a NULL mddev->private value but still calls raid5_quiesce, which reloads and dereferences that value. Reachability requires local low-privilege access and an md device without a private RAID5 configuration; the bounded consequence is a kernel crash.

The record

CVE
CVE-2025-71135
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
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=6.13
  2. Affected versionversion=be19e6e4339d1579d5f2fae8ce4facf9521dbbfc <20597b7229aea8b5bc45cd92097640257c7fc33b
  3. Affected versionversion=fa1944bbe6220eb929e2c02e5e8706b908565711 <7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9
  4. Affected versionversion=fa1944bbe6220eb929e2c02e5e8706b908565711 <e5abb6af905de6b2fead8a0b3f32ab0b81468a01

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.13; version=be19e6e4339d1579d5f2fae8ce4facf9521dbbfc <20597b7229aea8b5bc45cd92097640257c7fc33b; version=fa1944bbe6220eb929e2c02e5e8706b908565711 <7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9; version=fa1944bbe6220eb929e2c02e5e8706b908565711 <e5abb6af905de6b2fead8a0b3f32ab0b81468a01

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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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