Linux Kernel up to 6.13.4 optee denial of service

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5.0	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.13.4. Affected by this issue is some unknown functionality of the component optee. The manipulation results in denial of service. This vulnerability is reported as CVE-2025-21871. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.13.4. It has been classified as critical. Affected is some unknown functionality of the component optee. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix supplicant wait loop OP-TEE supplicant is a user-space daemon and it's possible for it be hung or crashed or killed in the middle of processing an OP-TEE RPC call. It becomes more complicated when there is incorrect shutdown ordering of the supplicant process vs the OP-TEE client application which can eventually lead to system hang-up waiting for the closure of the client application. Allow the client process waiting in kernel for supplicant response to be killed rather than indefinitely waiting in an unkillable state. Also, a normal uninterruptible wait should not have resulted in the hung-task watchdog getting triggered, but the endless loop would. This fixes issues observed during system reboot/shutdown when supplicant got hung for some reason or gets crashed/killed which lead to client getting hung in an unkillable state. It in turn lead to system being in hung up state requiring hard power off/on to recover.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2025-21871 since 12/29/2024. The exploitability is told to be difficult. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 234058 (SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:1178-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.291, 5.10.235, 5.15.179, 6.1.130, 6.6.80, 6.12.17 or 6.13.5 eliminates this vulnerability. Applying the patch 3eb4911364c764572e9db4ab900a57689a54e8ce/0180cf0373f84fff61b16f8c062553a13dd7cfca/c0a9a948159153be145f9471435695373904ee6d/ec18520f5edc20a00c34a8c9fdd6507c355e880f/d61cc1a435e6894bfb0dd3370c6f765d2d12825d/fd9d2d6124c293e40797a080adf8a9c237efd8b8/21234efe2a8474a6d2d01ea9573319de7858ce44/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 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 (234058) and CERT Bund (WID-SEC-2025-0649). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Google Container-Optimized OS
• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• Dell Avamar
• Open Source Linux Kernel
• SolarWinds Security Event Manager
• Dell NetWorker
• Dell Secure Connect Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.290
• 5.10.234
• 5.15.178
• 6.1.129
• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.6.35
• 6.6.36
• 6.6.37
• 6.6.38
• 6.6.39
• 6.6.40
• 6.6.41
• 6.6.42
• 6.6.43
• 6.6.44
• 6.6.45
• 6.6.46
• 6.6.47
• 6.6.48
• 6.6.49
• 6.6.50
• 6.6.51
• 6.6.52
• 6.6.53
• 6.6.54
• 6.6.55
• 6.6.56
• 6.6.57
• 6.6.58
• 6.6.59
• 6.6.60
• 6.6.61
• 6.6.62
• 6.6.63
• 6.6.64
• 6.6.65
• 6.6.66
• 6.6.67
• 6.6.68
• 6.6.69
• 6.6.70
• 6.6.71
• 6.6.72
• 6.6.73
• 6.6.74
• 6.6.75
• 6.6.76
• 6.6.77
• 6.6.78
• 6.6.79
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4
• 6.12.5
• 6.12.6
• 6.12.7
• 6.12.8
• 6.12.9
• 6.12.10
• 6.12.11
• 6.12.12
• 6.12.13
• 6.12.14
• 6.12.15
• 6.12.16
• 6.13.0
• 6.13.1
• 6.13.2
• 6.13.3
• 6.13.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 234058
Nessus Name: SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:1178-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.291/5.10.235/5.15.179/6.1.130/6.6.80/6.12.17/6.13.5
Patch: 3eb4911364c764572e9db4ab900a57689a54e8ce/0180cf0373f84fff61b16f8c062553a13dd7cfca/c0a9a948159153be145f9471435695373904ee6d/ec18520f5edc20a00c34a8c9fdd6507c355e880f/d61cc1a435e6894bfb0dd3370c6f765d2d12825d/fd9d2d6124c293e40797a080adf8a9c237efd8b8/21234efe2a8474a6d2d01ea9573319de7858ce44/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612

Timelineinfo

12/29/2024 🔍
03/27/2025 +88 days 🔍
03/27/2025 +0 days 🔍
12/07/2025 +255 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-21871 (🔍)
GCVE (CVE): GCVE-0-2025-21871
GCVE (VulDB): GCVE-100-301632
CERT Bund: WID-SEC-2025-0649 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/27/2025 16:18
Updated: 12/07/2025 12:37
Changes: 03/27/2025 16:18 (58), 04/10/2025 10:19 (2), 08/25/2025 03:35 (7), 10/29/2025 23:05 (12), 12/07/2025 12:37 (1)
Complete: 🔍
Cache ID: 216::103

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Discussion

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