Linux Kernel up to 7.1-rc2 mptcp mptcp_pm_add_timer locking

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.6.140/6.12.90/6.18.29/7.0.6/7.1-rc2. This affects the function mptcp_pm_add_timer of the component mptcp. The manipulation leads to locking. This vulnerability is documented as CVE-2026-46137. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.140/6.12.90/6.18.29/7.0.6/7.1-rc2. This issue affects the function mptcp_pm_add_timer of the component mptcp. The manipulation with an unknown input leads to a locking vulnerability. Using CWE to declare the problem leads to CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential data-race This mptcp_pm_add_timer() helper is executed as a timer callback in softirq context. To avoid any data races, the socket lock needs to be held with bh_lock_sock(). If the socket is in use, retry again soon after, similar to what is done with the keepalive timer.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-46137 since 05/13/2026. The exploitation is known to be difficult. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 321868 (Debian dsa-6355 : ata-modules-6.12.90+deb13-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.141, 6.12.91, 6.18.30, 7.0.7 or 7.1-rc3 eliminates this vulnerability. Applying the patch 013dcdc1961543b9a3433466bc8c79a2f4ca75b5/6e4710d7d8782cb61af29a7e7111ddfc38b9e1a3/2ad56e434199ca24a812bb353667aa1c3860f513/cc3c0399361efaaf7ae64262eb3f70829b1189c6/5cd6e0ad79d2615264f63929f8b457ad97ae550d 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 vulnerability database at Tenable (321868). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

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

CNA Base Score: 9.8
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Locking
CWE: CWE-667
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: 321868
Nessus Name: Debian dsa-6355 : ata-modules-6.12.90+deb13-armmp-di - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.141/6.12.91/6.18.30/7.0.7/7.1-rc3
Patch: 013dcdc1961543b9a3433466bc8c79a2f4ca75b5/6e4710d7d8782cb61af29a7e7111ddfc38b9e1a3/2ad56e434199ca24a812bb353667aa1c3860f513/cc3c0399361efaaf7ae64262eb3f70829b1189c6/5cd6e0ad79d2615264f63929f8b457ad97ae550d

Timelineinfo

05/13/2026 CVE reserved
05/28/2026 +15 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/21/2026 +24 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-46137 (🔒)
GCVE (CVE): GCVE-0-2026-46137
GCVE (VulDB): GCVE-100-366671

Entryinfo

Created: 05/28/2026 13:34
Updated: 06/21/2026 22:06
Changes: 05/28/2026 13:34 (59), 06/21/2026 08:50 (11), 06/21/2026 22:06 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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