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CVE-2025-38503

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix assertion when building free space tree When building the free space tree with the block group tree feature enabled,…

Published Aug 16, 2025CWE-617EPSS 0.15%

Overview

CVE-2025-38503 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

btrfs: fix assertion when building free space tree

When building the free space tree with the block group tree feature

enabled, we can hit an assertion failure like this:

BTRFS info (device loop0 state M): rebuilding free space tree

assertion failed: ret == 0, in fs/btrfs/free-space-tree.c:1102

------------[ cut here ]------------

kernel BUG at fs/btrfs/free-space-tree.c:1102!

Internal error: Oops - BUG: 00000000f2000800 [#1] SMP

Modules linked in:

CPU: 1 UID: 0 PID: 6592 Comm: syz-executor322 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025

pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102

lr : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102

sp : ffff8000a4ce7600

x29: ffff8000a4ce76e0

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/0bcc14f36c7ad37121cf5c0ae18cdde5bfad9c4eRefgit.kernel.org/stable/c/1961d20f6fa8903266ed9bd77c691924c22c8f02Refgit.kernel.org/stable/c/6bbe6530b1db7b4365ce9e86144c18c5d73b2c5bRefgit.kernel.org/stable/c/7c77df23324f60bcff0ea44392e2c82e9486640cRefgit.kernel.org/stable/c/f4428b2d4c68732653e93f748f538bdee639ff80Reflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38503?

CVE-2025-38503 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38503?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38503?

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-2025-38503?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38503 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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