Linux Kernel up to 6.16-rc5 ksmbd ksmbd_iov_pin_rsp use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.1.145/6.6.98/6.12.38/6.15.6/6.16-rc5. This impacts the function ksmbd_iov_pin_rsp of the component ksmbd. The manipulation results in use after free. This vulnerability is known as CVE-2025-38437. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.1.145/6.6.98/6.12.38/6.15.6/6.16-rc5. Affected is the function ksmbd_iov_pin_rsp of the component ksmbd. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix potential use-after-free in oplock/lease break ack If ksmbd_iov_pin_rsp return error, use-after-free can happen by accessing opinfo->state and opinfo_put and ksmbd_fd_put could called twice.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2025-38437 since 04/16/2025. The exploitability is told to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 270134 (Debian dla-4328 : linux-config-6.1 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.146, 6.6.99, 6.12.39, 6.15.7 or 6.16-rc6 eliminates this vulnerability. Applying the patch e38ec88a2b42c494601b1213816d75f0b54d9bf0/97c355989928a5f60b228ef5266c1be67a46cdf9/815f1161d6dbc4c54ccf94b7d3fdeab34b4d7477/8106adc21a2270c16abf69cd74ccd7c79c6e7acd/50f930db22365738d9387c974416f38a06e8057e 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 (270134), EUVD (EUVD-2025-22704) and CERT Bund (WID-SEC-2025-1653). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • Dell Avamar
  • Open Source Linux Kernel
  • Dell NetWorker
  • 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: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 270134
Nessus Name: Debian dla-4328 : linux-config-6.1 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.146/6.6.99/6.12.39/6.15.7/6.16-rc6
Patch: e38ec88a2b42c494601b1213816d75f0b54d9bf0/97c355989928a5f60b228ef5266c1be67a46cdf9/815f1161d6dbc4c54ccf94b7d3fdeab34b4d7477/8106adc21a2270c16abf69cd74ccd7c79c6e7acd/50f930db22365738d9387c974416f38a06e8057e

Timelineinfo

04/16/2025 CVE reserved
07/25/2025 +100 days Advisory disclosed
07/25/2025 +0 days VulDB entry created
01/03/2026 +162 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-38437 (🔒)
GCVE (CVE): GCVE-0-2025-38437
GCVE (VulDB): GCVE-100-317700
EUVD: 🔒
CERT Bund: WID-SEC-2025-1653 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 07/25/2025 19:07
Updated: 01/03/2026 23:09
Changes: 07/25/2025 19:07 (59), 07/29/2025 21:24 (1), 08/21/2025 05:14 (7), 09/15/2025 02:14 (1), 09/29/2025 00:24 (1), 10/14/2025 05:48 (2), 11/02/2025 13:03 (1), 11/17/2025 06:19 (1), 12/23/2025 00:48 (11), 12/23/2025 08:51 (1), 01/03/2026 23:09 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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