Linux Kernel up to 6.17-rc1 smb race condition

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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc1 and classified as critical. The affected element is an unknown function of the component smb. Such manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2025-39825. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc1. It has been rated as critical. Affected by this issue is an unknown code of the component smb. Using CWE to declare the problem leads to 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. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix race with concurrent opens in rename(2) Besides sending the rename request to the server, the rename process also involves closing any deferred close, waiting for outstanding I/O to complete as well as marking all existing open handles as deleted to prevent them from deferring closes, which increases the race window for potential concurrent opens on the target file. Fix this by unhashing the dentry in advance to prevent any concurrent opens on the target.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-39825 since 04/16/2025. The exploitation is known to be difficult. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 265221 (Linux Distros Unpatched Vulnerability : CVE-2025-39825), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.150, 6.6.104, 6.12.45, 6.16.5 or 6.17-rc2 eliminates this vulnerability. Applying the patch c9e7de284da0be5b44dbe79d71573f9f7f9b144c/24b9ed739c8c5b464d983e12cf308982f3ae93c2/c9991af5e09924f6f3b3e6996a5e09f9504b4358/289f945acb20b9b54fe4d13895e44aa58965ddb2/d84291fc7453df7881a970716f8256273aca5747 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 (265221) and CERT Bund (WID-SEC-2025-2077). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265221
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39825

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.150/6.6.104/6.12.45/6.16.5/6.17-rc2
Patch: c9e7de284da0be5b44dbe79d71573f9f7f9b144c/24b9ed739c8c5b464d983e12cf308982f3ae93c2/c9991af5e09924f6f3b3e6996a5e09f9504b4358/289f945acb20b9b54fe4d13895e44aa58965ddb2/d84291fc7453df7881a970716f8256273aca5747

Timelineinfo

04/16/2025 CVE reserved
09/16/2025 +153 days Advisory disclosed
09/16/2025 +0 days VulDB entry created
01/16/2026 +122 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39825 (🔒)
GCVE (CVE): GCVE-0-2025-39825
GCVE (VulDB): GCVE-100-324440
CERT Bund: WID-SEC-2025-2077 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 16:04
Updated: 01/16/2026 22:33
Changes: 09/16/2025 16:04 (57), 09/19/2025 19:46 (2), 10/21/2025 09:06 (7), 12/27/2025 18:36 (1), 01/16/2026 22:33 (12)
Complete: 🔍
Cache ID: 216::103

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