---
title: "CVE-2026-89815: Linux Kernel drm/ttm - Use After Free"
description: "Linux kernel drm/ttm contains a use-after-free vulnerability caused by not dropping tt->restore after successful restore in ttm_pool_restore_and_alloc(), letting attackers cause system instability or crashes, exploit requires kernel-level access."
url: https://panop.io/threat-heartbeat/CVE-2026-89815/
---

# CVE-2026-89815 Linux Kernel drm/ttm - Use After Free

Linux kernel drm/ttm contains a use-after-free vulnerability caused by not dropping tt->restore after successful restore in ttm\_pool\_restore\_and\_alloc(), letting attackers cause system instability or crashes, exploit requires kernel-level access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89815)

## Details

Type

Use After Free

Impact

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

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for ttm\_pool\_restore\_and\_alloc()

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-2026-89815](https://nvd.nist.gov/vuln/detail/CVE-2026-89815)
- [https://git.kernel.org/stable/c/a46ab76b6cf5478e2ac7b942a377c7a1827b436a](https://git.kernel.org/stable/c/a46ab76b6cf5478e2ac7b942a377c7a1827b436a)
- [https://git.kernel.org/stable/c/329ddc5d438f991f49e4fd24c704d1c7288d5e03](https://git.kernel.org/stable/c/329ddc5d438f991f49e4fd24c704d1c7288d5e03)
- [https://git.kernel.org/stable/c/941ac10529b3be5965a88d432a161ab459672ba8](https://git.kernel.org/stable/c/941ac10529b3be5965a88d432a161ab459672ba8)

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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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