---
title: "CVE-2026-90071: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in net/sched sch_teql due to failure to restore skb->dev on slave transmit failure, letting attackers cause kernel memory corruption, exploit requires crafted network packets."
url: https://panop.io/threat-heartbeat/CVE-2026-90071/
---

# CVE-2026-90071 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in net/sched sch\_teql due to failure to restore skb->dev on slave transmit failure, letting attackers cause kernel memory corruption, exploit requires crafted network packets.

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-2026-90071)

## Details

Type

Use After Free

Impact

Denial Of Service, Privilege Escalation

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 for skb->dev restoration in sch\_teql.

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-2026-90071](https://nvd.nist.gov/vuln/detail/CVE-2026-90071)
- [https://git.kernel.org/stable/c/aa39a790d56b40bfcf3861653ceb46a3a113adb6](https://git.kernel.org/stable/c/aa39a790d56b40bfcf3861653ceb46a3a113adb6)
- [https://git.kernel.org/stable/c/d453bf439ef230b5743afc25e194adacca8c6e43](https://git.kernel.org/stable/c/d453bf439ef230b5743afc25e194adacca8c6e43)
- [https://git.kernel.org/stable/c/dc4b95b8fee95113587e93ca116356032d271371](https://git.kernel.org/stable/c/dc4b95b8fee95113587e93ca116356032d271371)
- [https://git.kernel.org/stable/c/00d8a387b23b7831ad9919256a6b9caaa10f19c3](https://git.kernel.org/stable/c/00d8a387b23b7831ad9919256a6b9caaa10f19c3)
- [https://git.kernel.org/stable/c/012559cf3c67ce8825a31d4f66b040b6fbaf775e](https://git.kernel.org/stable/c/012559cf3c67ce8825a31d4f66b040b6fbaf775e)
- [https://git.kernel.org/stable/c/0cd75037948567193f7f5767176538822ce23873](https://git.kernel.org/stable/c/0cd75037948567193f7f5767176538822ce23873)
- [https://git.kernel.org/stable/c/1360bc93f5be1be3cf937ebea667b3418dd30a79](https://git.kernel.org/stable/c/1360bc93f5be1be3cf937ebea667b3418dd30a79)
- [https://git.kernel.org/stable/c/96bc345a3f17543d0d92ada609e02198d6380e26](https://git.kernel.org/stable/c/96bc345a3f17543d0d92ada609e02198d6380e26)

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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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