In the Linux kernel, the following vulnerability has been resolved: s390/monwriter: Reject buffer reuse with different data length When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs. However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low. Fix this by checking for changed data length and rejecting such records.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/01f3ce411711c2c919598ea25320a5a48f71edbc cve-icon cve-icon
https://git.kernel.org/stable/c/036bc5661060702e798d215e81bb46da530965b3 cve-icon cve-icon
https://git.kernel.org/stable/c/096dff1247037d329c04b3a5be0ecdfb1c5c7ac6 cve-icon cve-icon
https://git.kernel.org/stable/c/2995ccec260caa9e85b3301a4aba1e66ed80ad74 cve-icon cve-icon
https://git.kernel.org/stable/c/759d91378203ea35fa9bca6726dcf0010de081fb cve-icon cve-icon
https://git.kernel.org/stable/c/ae5347f3db1782c6118f6cc0d9fd8b1d43397db3 cve-icon cve-icon
https://git.kernel.org/stable/c/d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab cve-icon cve-icon
https://git.kernel.org/stable/c/f0745496f7c171271cafd9457df3b914a483ddeb cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2026081510-CVE-2026-72025-3a2a@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-72025 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-72025 cve-icon
History

Mon, 17 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119

Mon, 17 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Sat, 15 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119

Sat, 15 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: s390/monwriter: Reject buffer reuse with different data length When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs. However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low. Fix this by checking for changed data length and rejecting such records.
Title s390/monwriter: Reject buffer reuse with different data length
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-15T05:51:49.928Z

Updated: 2026-08-18T06:56:09.214Z

Reserved: 2026-08-09T03:40:39.900Z

Link: CVE-2026-72025

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:21:01.580

Modified: 2026-08-18T07:16:52.647

Link: CVE-2026-72025

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-15T00:00:00Z

Links: CVE-2026-72025 - Bugzilla