---
title: "CVE-2026-90392: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by accessing bpf link program pointer without proper locking in bpf_link_show_fdinfo and bpf_link_get_info_by_fd, letting attackers cause memory corruption, exploit requires concurrent bpf_link_update."
url: https://panop.io/threat-heartbeat/CVE-2026-90392/
---

# CVE-2026-90392 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by accessing bpf link program pointer without proper locking in bpf\_link\_show\_fdinfo and bpf\_link\_get\_info\_by\_fd, letting attackers cause memory corruption, exploit requires concurrent bpf\_link\_update.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90392)

## Details

Type

Use After Free

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90392](https://nvd.nist.gov/vuln/detail/CVE-2026-90392)
- [https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b](https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b)
- [https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e](https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e)
- [https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f](https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f)
- [https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3](https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3)
- [https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b](https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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