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CVE-2025-38221

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ext4: fix out of bounds punch offset Punching a hole with a start offset that exceeds max_end is not permitted and will result…

Published Jul 4, 2025CWE-125EPSS 0.17%

Overview

CVE-2025-38221 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

ext4: fix out of bounds punch offset

Punching a hole with a start offset that exceeds max_end is not

permitted and will result in a negative length in the

truncate_inode_partial_folio() function while truncating the page cache,

potentially leading to undesirable consequences.

A simple reproducer:

truncate -s 9895604649994 /mnt/foo

xfs_io -c "pwrite 8796093022208 4096" /mnt/foo

xfs_io -c "fpunch 8796093022213 25769803777" /mnt/foo

kernel BUG at include/linux/highmem.h:275!

Oops: invalid opcode: 0000 [#1] SMP PTI

CPU: 3 UID: 0 PID: 710 Comm: xfs_io Not tainted 6.15.0-rc3

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014

RIP: 0010:zero_user_segments.constprop.0+0xd7/0x110

RSP: 0018:ffffc90001cf3b38 EFLAGS: 00010287

RAX: 0000000000000005 RBX: ffffea0001485e40 RCX: 0000000000001000

RDX: 000000000040b000 RSI: 0000000000000005 RDI: 000000000040b000

RBP: 000000000

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/28b62cb58fd014338f5004170f2e3a35bf0af238Refgit.kernel.org/stable/c/a4d60ba277ecd8a98c5a593cbc0ef2237c20a541Refgit.kernel.org/stable/c/b5e58bcd79625423487fa3ecba8e8411b5396327

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38221?

CVE-2025-38221 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-38221?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2025-38221?

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-2025-38221?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38221 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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