Linux Kernel up to 6.12.63/6.18.3/6.19-rc3 raid5_store_group_thread_cnt null pointer dereference

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5.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.63/6.18.3/6.19-rc3. Affected is the function raid5_store_group_thread_cnt. Executing a manipulation can lead to null pointer dereference. This vulnerability appears as CVE-2025-71135. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.63/6.18.3/6.19-rc3. It has been declared as critical. This vulnerability affects the function raid5_store_group_thread_cnt. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt() The variable mddev->private is first assigned to conf and then checked: conf = mddev->private; if (!conf) ... If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce(): raid5_quiesce(mddev, true); raid5_quiesce(mddev, false); since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example: conf->quiesce = 0; wake_up(&conf->wait_for_quiescent); To fix this issue, the function should unlock mddev and return before invoking raid5_quiesce() when conf is NULL, following the existing pattern in raid5_change_consistency_policy().

The advisory is available at git.kernel.org. This vulnerability was named CVE-2025-71135 since 01/13/2026. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 298917 (SUSE SLES15 Security Update : kernel (SUSE-SU-2026:0472-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.64, 6.18.4 or 6.19-rc4 eliminates this vulnerability. Applying the patch 20597b7229aea8b5bc45cd92097640257c7fc33b/e5abb6af905de6b2fead8a0b3f32ab0b81468a01/7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (298917) and CERT Bund (WID-SEC-2026-0119). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298917
Nessus Name: SUSE SLES15 Security Update : kernel (SUSE-SU-2026:0472-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.64/6.18.4/6.19-rc4
Patch: 20597b7229aea8b5bc45cd92097640257c7fc33b/e5abb6af905de6b2fead8a0b3f32ab0b81468a01/7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9

Timelineinfo

01/13/2026 CVE reserved
01/14/2026 +1 days Advisory disclosed
01/14/2026 +0 days VulDB entry created
03/25/2026 +70 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71135 (🔒)
GCVE (CVE): GCVE-0-2025-71135
GCVE (VulDB): GCVE-100-341098
CERT Bund: WID-SEC-2026-0119 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 01/14/2026 17:52
Updated: 03/25/2026 19:13
Changes: 01/14/2026 17:52 (58), 01/16/2026 07:08 (7), 02/15/2026 00:59 (2), 03/25/2026 19:13 (10)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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