High 8.1Published Feb 26, 2025

CVE-2025-21765ipv6: use RCU protection in ip6_default_advmss()

Updated under an hour ago (Oct 26, 2026, 12:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 78ad057472d8c76e0602402269222f9f9c698790; from 5578689a4e3c04f2d43ea39736fd3fa396d80c6e before d02f30d220ef9511568a48dba8a9004c65f8d904; 5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 28de355b63ad42309ed5a03ee7c436c90512265b; from 5578689a4e3c04f2d43ea39736fd3fa396d80c6e before 84212387caadb211cd9dadd6fd5563bd37dc1f5e; 5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 4176a68b0db8fc74ac14fcd00ba8231371051dc2; 5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 713a40c892f40300d63691d9f85b2a23b48fe1e8; 5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 550ed693f47370502a71b85382e7f9e6417300b8; 5578689a4e3c04f2d43ea39736fd3fa396d80c6e builds before 3c8ffcd248da34fc41e52a46e51505900115fc2a	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.26 before 5.4.291; from 5.5 before 5.10.235; from 5.11 before 5.15.179; from 5.16 before 6.1.129; from 6.2 before 6.6.79; from 6.7 before 6.12.16; from 6.13 before 6.13.4; 6.14; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/78ad057472d8c76e0602402269222f9f9c698790	patch
https://git.kernel.org/stable/c/d02f30d220ef9511568a48dba8a9004c65f8d904	patch
https://git.kernel.org/stable/c/28de355b63ad42309ed5a03ee7c436c90512265b	patch
https://git.kernel.org/stable/c/84212387caadb211cd9dadd6fd5563bd37dc1f5e	patch
https://git.kernel.org/stable/c/4176a68b0db8fc74ac14fcd00ba8231371051dc2	patch
https://git.kernel.org/stable/c/713a40c892f40300d63691d9f85b2a23b48fe1e8	patch
https://git.kernel.org/stable/c/550ed693f47370502a71b85382e7f9e6417300b8	patch
https://git.kernel.org/stable/c/3c8ffcd248da34fc41e52a46e51505900115fc2a	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.