CVE-2025-21765

HIGH

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear.

CVSS v3.1 Score

8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 2/27/2025Modified: 7/30/2026

Related Intelligence (1)

CRITICALAi

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-209-04.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommend

CVE-2021-41617CVE-2023-28531
CISA Advisories

References (13)

https://git.kernel.org/stable/c/28de355b63ad42309ed5a03ee7c436c90512265bPatchhttps://git.kernel.org/stable/c/3c8ffcd248da34fc41e52a46e51505900115fc2aPatchhttps://git.kernel.org/stable/c/4176a68b0db8fc74ac14fcd00ba8231371051dc2Patchhttps://git.kernel.org/stable/c/550ed693f47370502a71b85382e7f9e6417300b8Patchhttps://git.kernel.org/stable/c/713a40c892f40300d63691d9f85b2a23b48fe1e8Patchhttps://git.kernel.org/stable/c/78ad057472d8c76e0602402269222f9f9c698790Patchhttps://git.kernel.org/stable/c/84212387caadb211cd9dadd6fd5563bd37dc1f5ePatchhttps://git.kernel.org/stable/c/d02f30d220ef9511568a48dba8a9004c65f8d904Patchhttps://lists.debian.org/debian-lts-announce/2025/03/msg00028.htmlhttps://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-265688.html