PT-2025-27996 · Linux+1 · Linux Kernel+1

Published 2025-07-04 · Updated 2025-07-04 · CVE-2025-38221

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to the fixed version

Description: The issue is related to the ext4 file system in the Linux kernel. It occurs when punching a hole with a start offset that exceeds max end, resulting in a negative length in the truncate inode partial folio() function while truncating the page cache. This can lead to undesirable consequences. A reproducer for this issue involves using the truncate and xfs io commands to create a specific scenario that triggers the bug.

Recommendations: For Linux kernel versions prior to the fixed version, consider applying the fix that filters out cases where the punching start offset exceeds max end to prevent the out-of-bounds punch offset issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

BDU:2025-13483

CVE-2025-38221

Affected Products

Astra Linux

Linux Kernel

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38221.json · Exploit
• https://git.kernel.org/stable/c/b5e58bcd79625423487fa3ecba8e8411b5396327 · Patch
• https://linux.oracle.com/errata/ELSA-2025-20662.html · Vendor Advisory
• https://git.kernel.org/stable/c/a4d60ba277ecd8a98c5a593cbc0ef2237c20a541 · Patch
• https://bdu.fstec.ru/vul/2025-13483 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-38221 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-38221 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-38221 · Security Note
• https://ubuntu.com/security/CVE-2025-38221 · Vendor Advisory
• https://git.kernel.org/stable/c/28b62cb58fd014338f5004170f2e3a35bf0af238 · Patch
• https://osv.dev/vulnerability/CVE-2025-38221 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/2025070425-CVE-2025-38221-f152@gregkh · Note
• https://git.kernel.org/linus/b5e58bcd79625423487fa3ecba8e8411b5396327 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/1941133668388684093 · Twitter Post