---
title: "CVE-2026-89774: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in Bluetooth SCO caused by improper socket reference handling in sco_conn_ready and sco_get_sock_listen, letting attackers cause memory corruption, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-89774/
---

# CVE-2026-89774 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in Bluetooth SCO caused by improper socket reference handling in sco\_conn\_ready and sco\_get\_sock\_listen, letting attackers cause memory corruption, exploit requires local access.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89774)

## Details

Type

Use After Free

Impact

Denial Of Service, Privilege Escalation

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for Bluetooth SCO socket reference handling.

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-2026-89774](https://nvd.nist.gov/vuln/detail/CVE-2026-89774)
- [https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277](https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277)
- [https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2](https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2)
- [https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39](https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39)
- [https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8](https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8)
- [https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1](https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1)
- [https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc](https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc)

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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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