Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc3 mptcp race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc3. Affected is an unknown function of the component mptcp. The manipulation results in race condition. This vulnerability is cataloged as CVE-2026-97523. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc3. Affected is an unknown functionality of the component mptcp. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mptcp: close race between scheduler and state change The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-97523 since 09/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 364137 (Oracle Linux 9 : Unbreakable Enterprise kernel (ELSA-2026-500374)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.111, 6.18.53, 7.2.7 or 7.3-rc4 eliminates this vulnerability. Applying the patch 8f11430d51ff8365bc51b670bc3002b65ae4c6b7/a09c87abf10a0a7e203137c75b5381aa63d9b31d/4c856f3c151a2f3fa237caa651c44015916ca584/42064de57fb83231fcc89663a94885f228a1ee53 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 (364137). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (Linux): 🔒

CVSSv2info

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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: 🔒

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Nessus ID: 364137
Nessus Name: Oracle Linux 9 : Unbreakable Enterprise kernel (ELSA-2026-500374)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.111/6.18.53/7.2.7/7.3-rc4
Patch: 8f11430d51ff8365bc51b670bc3002b65ae4c6b7/a09c87abf10a0a7e203137c75b5381aa63d9b31d/4c856f3c151a2f3fa237caa651c44015916ca584/42064de57fb83231fcc89663a94885f228a1ee53

Timelineinfo

09/24/2026 CVE reserved
09/25/2026 +1 days Advisory disclosed
09/25/2026 +0 days VulDB entry created
10/08/2026 +13 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-97523 (🔒)
GCVE (CVE): GCVE-0-2026-97523
GCVE (VulDB): GCVE-100-409914

Entryinfo

Created: 09/25/2026 12:45
Updated: 10/08/2026 17:08
Changes: 09/25/2026 12:45 (58), 10/05/2026 07:57 (10), 10/08/2026 17:08 (2)
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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