CVE-2025-21791

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
LinuxCNA
---
---
CISA-ADPADP
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 2%
VendorProductVersion
linuxlinux_kernel
4.9 ≤
𝑥
< 6.1.129
linuxlinux_kernel
6.2 ≤
𝑥
< 6.6.79
linuxlinux_kernel
6.7 ≤
𝑥
< 6.12.16
linuxlinux_kernel
6.13 ≤
𝑥
< 6.13.4
linuxlinux_kernel
6.14:rc1
linuxlinux_kernel
6.14:rc2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bullseye
vulnerable
bullseye (security)
vulnerable
bookworm
6.1.129-1
fixed
bookworm (security)
vulnerable
trixie
6.12.20-1
fixed
sid
6.12.21-1
fixed
linux-6.1
bullseye (security)
6.1.129-1~deb11u1
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://git.kernel.org/stable/c/022cac1c693add610ae76ede03adf4d9d5a2cf21
https://git.kernel.org/stable/c/20a3489b396764cc9376e32a9172bee26a89dc3b
https://git.kernel.org/stable/c/5bb4228c32261d06e4fbece37ec3828bcc005b6b
https://git.kernel.org/stable/c/6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e
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