PT-2025-8877 · Linux+9 · Linux Kernel+9

Published 2025-02-07 · Updated 2026-04-20 · CVE-2025-21765

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description A vulnerability in the Linux kernel has been resolved. The issue is related to the function ip6 default advmss(), which requires RCU protection to prevent the net structure it reads from disappearing.

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

Exploit

Weakness Enumeration

CWE-414

Related Identifiers

ALSA-2025:20095

ALSA-2025:20518

BDU:2025-12057

CVE-2025-21765

DLA-4102-1

DLA-4178-1

INFSA-2025_20518

OESA-2025-1446

OESA-2025-1450

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

RHSA-2025:20095

RHSA-2025:20518

RHSA-2025_20518

SUSE-SU-2025:01919-1

SUSE-SU-2025:01951-1

SUSE-SU-2025:01967-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:1293-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_01951-1

SUSE-SU-2025_01967-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

SUSE-SU-2025_1293-1

SUSE-SU-2026:0474-1

SUSE-SU-2026:0475-1

SUSE-SU-2026:0495-1

SUSE-SU-2026:0496-1

SUSE-SU-2026:0617-1

SUSE-SU-2026:1131-1

USN-7510-1

USN-7510-2

USN-7510-3

USN-7510-4

USN-7510-5

USN-7510-6

USN-7510-7

USN-7510-8

USN-7511-1

USN-7511-2

USN-7511-3

USN-7512-1

USN-7516-1

USN-7516-2

USN-7516-3

USN-7516-4

USN-7516-5

USN-7516-6

USN-7516-7

USN-7516-8

USN-7516-9

USN-7517-1

USN-7517-2

USN-7517-3

USN-7518-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7539-1

USN-7540-1

USN-7593-1

USN-7602-1

USN-7640-1

USN-7703-1

USN-7703-2

USN-7703-3

USN-7703-4

USN-7719-1

USN-7737-1

Affected Products

Almalinux

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Hat

Red Os

Rocky Linux

Suse

Ubuntu

References · 3766

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21765.json · Exploit
• https://ubuntu.com/security/CVE-2024-53161 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-52332 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-57910 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-35958 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7510-4 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-53181 · Security Note
• https://ubuntu.com/security/CVE-2025-21864 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0496-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21739 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-53101 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-22013 · Security Note
• https://ubuntu.com/security/CVE-2024-58080 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7516-4 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-23138 · Vendor Advisory