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CVE-2025-38710

7.8 · HIGH

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(…

Published Sep 4, 2025EPSS 0.16%

Overview

CVE-2025-38710 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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'.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/076e992752e4b24178918f748d75597c80a408d2Refgit.kernel.org/stable/c/112bb60cd0e254a369e95aa9941a694ffeca089fRefgit.kernel.org/stable/c/366183911b153e9b8cf758e1414e1154d7569337Refgit.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53dRefgit.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197bRefgit.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0Refgit.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7Refgit.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38710?

CVE-2025-38710 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38710?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38710?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38710?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38710 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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