Linux Kernel up to 7.1.4 IB-mlx5 mlx5_ib_reg_user_mr race condition

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.7	$0-$5k	0.00

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 7.1.4. This impacts the function mlx5_ib_reg_user_mr of the component IB-mlx5. This manipulation causes race condition. This vulnerability is tracked as CVE-2026-80880. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been declared as very critical. Affected by this vulnerability is the function mlx5_ib_reg_user_mr of the component IB-mlx5. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Properly support implicit ODP rereg_mr Due to all the child mkeys in the implicit ODP configuration we cannot change anything in place for the parent mkey. Instead the whole thing needs to be rebuilt if any change is requested. If the user does not specify a translation then force the implicit values which will then fall through the logic into mlx5_ib_reg_user_mr() to allocate a completely new MR. Since implicit children were also touching the mr->pd, this removes another case where the access was racy.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-80880 since 08/26/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 343463 (Linux Distros Unpatched Vulnerability : CVE-2026-80880), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40 or 7.1.5 eliminates this vulnerability. Applying the patch cbc9982c8573fb9e35040063aa78c8ebe768a1ff/ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69/94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb/eb7cb798e563b3f3b3baeb9cc6f7455764267e50/d4f84bfa089fe71f775d25beb29303e844494c25/5d02b9a2efd11d28d2a8feac7769686b1b871d9c/ee7a8335069150c3f1893a697ab30bbeca00d796 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (343463). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.211
• 6.1.177
• 6.6.144
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4
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• 6.12.90
• 6.12.91
• 6.12.92
• 6.12.93
• 6.12.94
• 6.12.95
• 6.12.96
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
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• 6.18.34
• 6.18.35
• 6.18.36
• 6.18.37
• 6.18.38
• 6.18.39
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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: 343463
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-80880

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5
Patch: cbc9982c8573fb9e35040063aa78c8ebe768a1ff/ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69/94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb/eb7cb798e563b3f3b3baeb9cc6f7455764267e50/d4f84bfa089fe71f775d25beb29303e844494c25/5d02b9a2efd11d28d2a8feac7769686b1b871d9c/ee7a8335069150c3f1893a697ab30bbeca00d796

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/08/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80880 (🔒)
GCVE (CVE): GCVE-0-2026-80880
GCVE (VulDB): GCVE-100-399067

Entryinfo

Created: 09/04/2026 19:22
Updated: 09/08/2026 00:53
Changes: 09/04/2026 19:22 (59), 09/08/2026 00:53 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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