CVE-2025-68353
Unknown Unknown - Not Provided
NULL Pointer Dereference in Linux Kernel VXLAN Causes Kernel Crash

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

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.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-05-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-05-05
NVD
CVE-2025-68353
EUVD
EUVD-2025-205101
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux kernel 6.7
linux linux_kernel 6.7
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a NULL pointer dereference in the Linux kernel's VXLAN networking code, specifically in the function vxlan_xmit_one. The issue occurs because the sock4 and sock6 pointers are not guaranteed to be non-NULL, for example, if the network interface is brought down. This can cause the kernel to dereference a NULL pointer, leading to a kernel crash (BUG). The problem arose after certain commits removed validity checks for these pointers, and the fix involved restoring those checks.


How can this vulnerability impact me? :

This vulnerability can cause the Linux kernel to crash due to a NULL pointer dereference when handling VXLAN network packets. Such a crash can lead to denial of service (DoS) on the affected system, potentially disrupting network communication and system availability.


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