VDB-322563 · CVE-2025-38710 · Nessus 261578

Linux Kernel up to 6.12.42/6.15.10/6.16.1 gfs2 dir_e_read privilege escalation

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5.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.12.42/6.15.10/6.16.1 and classified as problematic. Affected is the function dir_e_read of the component gfs2. Performing a manipulation results in an unknown weakness. This vulnerability was named CVE-2025-38710. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.12.42/6.15.10/6.16.1. This affects the function dir_e_read of the component gfs2. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: gfs2: Validate i_depth for exhash directories A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at: index = hash >> (32 - dip->i_depth); As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time. So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there. Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated. Tested with the syzkaller repro.c and xfstests '-g quick'.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-38710 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 261578 (Linux Distros Unpatched Vulnerability : CVE-2025-38710), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.43, 6.15.11, 6.16.2 or 6.17-rc1 eliminates this vulnerability. Applying the patch 53a0249d68a210c16e961b83adfa82f94ee0a53d/b5f46951e62377b6e406fadc18bc3c5bdf1632a7/9680c58675b82348ab84d387e4fa727f7587e1a0/557c024ca7250bb65ae60f16c02074106c2f197b 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 (261578) and CERT Bund (WID-SEC-2025-1976). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Debian Linux
Amazon Linux 2
Open Source Linux Kernel
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Microsoft Azure
Dell Secure Connect Gateway
IBM QRadar SIEM
IBM Security Verify Access
Dell NetWorker

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒