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CVE-2025-21791

HighCVSS 7.8/10Last modified Oct 15, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

vrf: use RCU protection in l3mdev_l3_out()

l3mdev_l3_out() can be called without RCU being held:

raw_sendmsg() ip_push_pending_frames() ip_send_skb() ip_local_out() __ip_local_out() l3mdev_ip_out()

Add rcu_read_lock() / rcu_read_unlock() pair to avoid a potential UAF.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Linux	Linux	>= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 20a3489b396764cc9376e32a9172bee26a89dc3b; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 5bb4228c32261d06e4fbece37ec3828bcc005b6b; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < c7574740be8ce68a57d0aece24987b9be2114c3c; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < c40cb5c03e37552d6eff963187109e2c3f78ef6f; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 022cac1c693add610ae76ede03adf4d9d5a2cf21; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 7b81425b517accefd46bee854d94954f5c57e019; >= a8e3e1a9f02094145580ea7920c6a1d9aabd5539, < 6d0ce46a93135d96b7fa075a94a88fe0da8e8773
Linux	Linux	4.9
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	< *

References

Timeline

Published: Feb 27, 2025
Last modified: Oct 15, 2026
NVD status: Modified

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CVE-2025-21791: High severity, CVSS 7.8 | Vulnix