Linux Kernel up to 7.2.6 SMB Server improper synchronization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k5.56+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.6. It has been declared as critical. This affects an unknown function of the component SMB Server. The manipulation results in improper synchronization. This vulnerability is known as CVE-2026-98439. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 7.2.6. Affected is some unknown processing of the component SMB Server. The manipulation with an unknown input leads to a improper synchronization vulnerability. CWE is classifying the issue as CWE-662. The product utilizes multiple threads or processes to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: smb/server: cancel async requests when closing connection An async request may still be waiting when a connection is closed. This can stop the connection from closing. Cancel active async requests before waiting for them to finish.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-98439 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. 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 10/18/2026).

Upgrading to version 7.2.7 or 7.3-rc1 eliminates this vulnerability. Applying the patch 0947087678f465b64eba2acebe808d5c6cfea036/4fd5bad647bfa45eb86bfd2f03ba1bef3fcd5851 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Improper synchronization
CWE: CWE-662
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 7.2.7/7.3-rc1
Patch: 0947087678f465b64eba2acebe808d5c6cfea036/4fd5bad647bfa45eb86bfd2f03ba1bef3fcd5851

Timelineinfo

09/25/2026 CVE reserved
10/18/2026 +23 days Advisory disclosed
10/18/2026 +0 days VulDB entry created
10/18/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98439 (🔒)
GCVE (CVE): GCVE-0-2026-98439
GCVE (VulDB): GCVE-100-421770

Entryinfo

Created: 10/18/2026 17:04
Changes: 10/18/2026 17:04 (58)
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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