CVE-2025-21791: vrf: use RCU protection in l3mdev_l3_out()
First published: Thu Feb 27 2025(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=4.9<6.1.129 | |
| Linux Kernel | >=6.2<6.6.79 | |
| Linux Kernel | >=6.7<6.12.16 | |
| Linux Kernel | >=6.13<6.13.4 | |
| Linux Kernel | =6.14-rc1 | |
| Linux Kernel | =6.14-rc2 |
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Reference Links
- https://git.kernel.org/stable/c/022cac1c693add610ae76ede03adf4d9d5a2cf21
- https://git.kernel.org/stable/c/6d0ce46a93135d96b7fa075a94a88fe0da8e8773
- https://git.kernel.org/stable/c/7b81425b517accefd46bee854d94954f5c57e019
- https://git.kernel.org/stable/c/c40cb5c03e37552d6eff963187109e2c3f78ef6f
- https://git.kernel.org/stable/c/c7574740be8ce68a57d0aece24987b9be2114c3c
- https://git.kernel.org/stable/c/6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e
- https://git.kernel.org/stable/c/20a3489b396764cc9376e32a9172bee26a89dc3b
- https://git.kernel.org/stable/c/5bb4228c32261d06e4fbece37ec3828bcc005b6b
Frequently Asked Questions
What is the severity of CVE-2025-21791?
CVE-2025-21791 has a severity rating that reflects its potential impact on system stability and security.
What systems are affected by CVE-2025-21791?
CVE-2025-21791 affects the Linux kernel, particularly in functions related to routing traffic.
How do I fix CVE-2025-21791?
To fix CVE-2025-21791, update the Linux kernel to the latest version that includes the patch.
What does CVE-2025-21791 involve?
CVE-2025-21791 involves inadequate protection when calling l3mdev_l3_out() in the Linux kernel.
Is there a workaround for CVE-2025-21791?
There is no widely recommended workaround for CVE-2025-21791; updating the kernel is the best approach.
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