CVE-2025-40264 be2net: pass wrb_params in case of OS2BMC

Not scored Published 4 Dec 2025 Updated 2 Jun 2026

A NULL pointer dereference in the be2net driver can cause a system crash when sending packets to the BMC.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-40264?

CVE-2025-40264 is a vulnerability in Linux, published on 4 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:

be2net: pass wrb_params in case of OS2BMC

be_insert_vlan_in_pkt() is called with the wrb_params argument being NULL at be_send_pkt_to_bmc() call site. This may lead to dereferencing a NULL pointer when processing a workaround for specific packet, as commit bc0c3405abbb ("be2net: fix a Tx stall bug caused by a specific ipv6 packet") states.

The correct way would be to pass the wrb_params from be_xmit().

Which versions are affected by CVE-2025-40264?

How do I fix CVE-2025-40264?

Apply the vendor's patch.

Is CVE-2025-40264 being exploited?

There is no known exploitation of CVE-2025-40264 in the wild and no public exploit code.

Sources

Also known as AZL-71404, BELL-CVE-2025-40264, DEBIAN-CVE-2025-40264, GHSA-gvxj-xj5w-j8qf, ROOT-OS-DEBIAN-11-CVE-2025-40264, ROOT-OS-DEBIAN-12-CVE-2025-40264 and 4 more.