# CVE-2026-74527: octeontx2-af: Block VFs from clobbering special CGX PKIND state

> A malicious Virtual Function can overwrite critical physical function network parsing configurations, potentially leading to privilege escalation or data manipulation.

- **Severity:** High 8.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 15 Aug 2026
- **Updated:** 21 Oct 2026
- **Also known as:** BELL-CVE-2026-74527, DEBIAN-CVE-2026-74527, GHSA-vg39-x84f-cgrf, UBUNTU-CVE-2026-74527

## What is CVE-2026-74527?

CVE-2026-74527 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: Block VFs from clobbering special CGX PKIND state

PF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND
programming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must
not reset the LMAC RX PKIND or default TX parse config over the PF setup.

Add cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip
cgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates
when the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND.

## Which versions are affected by CVE-2026-74527?


## How do I fix CVE-2026-74527?

Apply the vendor's patch.

## Is CVE-2026-74527 being exploited?

There is no known exploitation of CVE-2026-74527 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74527 and fix it if it is affected.

What it is: CVE-2026-74527 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.
Exploitation: There is no known exploitation of CVE-2026-74527 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-74527/ (Markdown: https://insights.sbomify.com/CVE-2026-74527/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74527
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74527
- OSV: https://osv.dev/vulnerability/CVE-2026-74527

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74527/
Summaries are generated and may contain mistakes; the official description above is the record.