CVE-2025-68353 net: vxlan: prevent NULL deref in vxlan_xmit_one
A NULL pointer dereference in the Linux kernel VXLAN module allows remote attackers to cause a system crash via crafted network traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68353?
CVE-2025-68353 is a vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: vxlan: prevent NULL deref in vxlan_xmit_one
Neither sock4 nor sock6 pointers are guaranteed to be non-NULL in vxlan_xmit_one, e.g. if the iface is brought down. This can lead to the following NULL dereference:
BUG: kernel NULL pointer dereference, address: 0000000000000010 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:vxlan_xmit_one+0xbb3/0x1580 Call Trace: vxlan_xmit+0x429/0x610 dev_hard_start_xmit+0x55/0xa0 __dev_queue_xmit+0x6d0/0x7f0 ip_finish_output2+0x24b/0x590 ip_output+0x63/0x110
Mentioned commits changed the code path in vxlan_xmit_one and as a side effect the sock4/6 pointer validity checks in vxlan(6)_get_route were lost. Fix this by adding back checks.
Since both commits being fixed were released in the same version (v6.7) and are strongly related, bundle the fixes in a single commit.
Which versions are affected by CVE-2025-68353?
How do I fix CVE-2025-68353?
Apply the vendor's patch.
Is CVE-2025-68353 being exploited?
There is no known exploitation of CVE-2025-68353 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68353, DEBIAN-CVE-2025-68353, GHSA-cff3-j257-7hf4, ROOT-OS-DEBIAN-13-CVE-2025-68353, ROOT-OS-UBUNTU-2404-CVE-2025-68353, UBUNTU-CVE-2025-68353.