PT-2025-8846 · Linux+6 · Linux Kernel+6

Ekansh Gupta + 1 · Published 2025-01-10 · Updated 2026-04-20 · CVE-2025-21734

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A issue in the Linux kernel's fastrpc driver has been identified, where the calculation of page size for non-registered buffers does not account for the offset, potentially leading to improper and out-of-bounds page sizes being passed, resulting in memory issues. The problem arises when the driver copies the buffer and passes it to the remote subsystem.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Out of bounds Read

Weakness Enumeration

CWE-787

CWE-125

Related Identifiers

AZL-68970

BDU:2025-11880

CVE-2025-21734

DLA-4102-1

OESA-2025-1371

OESA-2025-1372

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

SUSE-SU-2025:01919-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7651-1

USN-7651-2

USN-7651-3

USN-7651-4

USN-7651-5

USN-7651-6

USN-7652-1

USN-7653-1

USN-7737-1

Affected Products

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 1556

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21734.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-21674 · Security Note
• https://ubuntu.com/security/CVE-2024-57997 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21844 · Security Note
• https://ubuntu.com/security/notices/USN-7651-6 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21727 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-11880 · Security Note
• https://ubuntu.com/security/CVE-2025-21721 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21716 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21871 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37798 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21725 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21745 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-2312 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21675 · Vendor Advisory