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CVE-2026-72312: octeontx2-af: fix VF bringup affecting PF promiscuous state

• Severity: high (CVSS 7.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

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.

Affected products

• Linux kernel: 5.14 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

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

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