CVE-2026-72312 octeontx2-af: fix VF bringup affecting PF promiscuous state
A vulnerability in the Linux kernel allows a virtual function to inadvertently disable the physical function's promiscuous mode, bypassing network monitoring security features.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72312?
CVE-2026-72312 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
octeontx2-af: fix VF bringup affecting PF promiscuous state
Mbox handling of nix_set_rx_mode for a VF with promiscuous and all_multi flags set to false causes deletion of the PF's promiscuous and allmulti MCAM rules. This occurs because the APIs that enable/disable these rules operate only on the PF, even when the mbox request is made via a VF interface.
Guard both rvu_npc_enable_allmulti_entry() and rvu_npc_enable_promisc_entry() disable paths with an is_vf() check so that a VF bringing up or tearing down its interface cannot inadvertently clear the PF's MCAM rules.
Which versions are affected by CVE-2026-72312?
How do I fix CVE-2026-72312?
Apply the vendor's patch.
Is CVE-2026-72312 being exploited?
There is no known exploitation of CVE-2026-72312 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72312, DEBIAN-CVE-2026-72312, GHSA-87w2-pjwv-62x9, UBUNTU-CVE-2026-72312.