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CVE-2025-38163

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on sbi->total_valid_block_count syzbot reported a f2fs bug as below: ------------[ cut here ]----…

Published Jul 3, 2025CWE-476EPSS 0.18%

Overview

CVE-2025-38163 is a medium-severity vulnerability. It was published on July 3, 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:

f2fs: fix to do sanity check on sbi->total_valid_block_count

syzbot reported a f2fs bug as below:

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

kernel BUG at fs/f2fs/f2fs.h:2521!

RIP: 0010:dec_valid_block_count+0x3b2/0x3c0 fs/f2fs/f2fs.h:2521

Call Trace:

f2fs_truncate_data_blocks_range+0xc8c/0x11a0 fs/f2fs/file.c:695

truncate_dnode+0x417/0x740 fs/f2fs/node.c:973

truncate_nodes+0x3ec/0xf50 fs/f2fs/node.c:1014

f2fs_truncate_inode_blocks+0x8e3/0x1370 fs/f2fs/node.c:1197

f2fs_do_truncate_blocks+0x840/0x12b0 fs/f2fs/file.c:810

f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:838

f2fs_truncate+0x417/0x720 fs/f2fs/file.c:888

f2fs_setattr+0xc4f/0x12f0 fs/f2fs/file.c:1112

notify_change+0xbca/0xe90 fs/attr.c:552

do_truncate+0x222/0x310 fs/open.c:65

handle_truncate fs/namei.c:3466 [inline]

do_open fs/namei.c:3849 [inline]

path_openat+0x2e4f/0x35d0 fs/namei.c:4004

do_filp_open+0x284/0x4e0 fs/namei.c:4031

do_sys_openat2+0x1

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/05872a167c2cab80ef186ef23cc34a6776a1a30cRefgit.kernel.org/stable/c/25f3776b58c1c45ad2e50ab4b263505b4d2378caRefgit.kernel.org/stable/c/49bc7bf38e42cfa642787e947f5721696ea73ac3Refgit.kernel.org/stable/c/65b3f76592aed5a43c4d79375ac097acf975972bRefgit.kernel.org/stable/c/6a324d77f7ea1a91d55c4b6ad970e3ac9ab6a20dRefgit.kernel.org/stable/c/a39cc43efc1bca74ed9d6cf9e60b995071f7d178Refgit.kernel.org/stable/c/ccc28c0397f75a3ec9539cceed9db014d7b73869Refgit.kernel.org/stable/c/f1b743c1955151bd392539b739a3ad155296be13Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38163?

CVE-2025-38163 is a medium-severity vulnerability. It was published on July 3, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38163?

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-2025-38163?

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-2025-38163?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38163 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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