---
title: "CVE-2026-90057: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in slip_receive_buf() caused by concurrent execution of slip_hangup() and slip_close(), letting attackers cause memory corruption, exploit requires racing against tty hangup."
url: https://panop.io/threat-heartbeat/CVE-2026-90057/
---

# CVE-2026-90057 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in slip\_receive\_buf() caused by concurrent execution of slip\_hangup() and slip\_close(), letting attackers cause memory corruption, exploit requires racing against tty hangup.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90057)

## Details

Type

Use After Free

Impact

Remote Code Execution, Denial Of Service

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 that removes slip\_hangup().

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-2026-90057](https://nvd.nist.gov/vuln/detail/CVE-2026-90057)
- [https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df](https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df)
- [https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6](https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6)
- [https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135](https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135)
- [https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce](https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce)
- [https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6](https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6)
- [https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529](https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529)

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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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