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 PFs 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 PFs MCAM rules.
References
- https://git.kernel.org/stable/c/212c59e5e416859579272288fd325148fc316109
- https://git.kernel.org/stable/c/3cf83432e0561aef6d7ec2664909d12d0ff0ffc1
- https://git.kernel.org/stable/c/3de77d2f34c2bc2acaedabc2c5e0a561b85c283a
- https://git.kernel.org/stable/c/53e17d9ed779ad25870abb9c31bc294c71a2278c
- https://git.kernel.org/stable/c/daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c
- https://git.kernel.org/stable/c/fabb881df322da25442f98d23f5fa371e3c78ec4