---
title: "CVE-2026-89997: Linux Kernel Device Mapper - Use After Free"
description: "Linux kernel device mapper contains a race condition caused by simultaneous resume and remove ioctls, letting attackers cause use-after-free by resuming a device after suspension without postsuspend call, exploit requires concurrent ioctl calls."
url: https://panop.io/threat-heartbeat/CVE-2026-89997/
---

# CVE-2026-89997 Linux Kernel Device Mapper - Use After Free

Linux kernel device mapper contains a race condition caused by simultaneous resume and remove ioctls, letting attackers cause use-after-free by resuming a device after suspension without postsuspend call, exploit requires concurrent ioctl calls.

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-2026-89997)

## Details

Type

Use After Free

Impact

Use After Free

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 dm resume-vs-remove race.

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-2026-89997](https://nvd.nist.gov/vuln/detail/CVE-2026-89997)
- [https://git.kernel.org/stable/c/1ede2bce2bd640605df83db1356fd727159bc9ed](https://git.kernel.org/stable/c/1ede2bce2bd640605df83db1356fd727159bc9ed)
- [https://git.kernel.org/stable/c/36177beff2a9df035991ad8d16ccf8d363ed93ee](https://git.kernel.org/stable/c/36177beff2a9df035991ad8d16ccf8d363ed93ee)
- [https://git.kernel.org/stable/c/3b59530b14fde693e41d8e39bc326df6cbf07b76](https://git.kernel.org/stable/c/3b59530b14fde693e41d8e39bc326df6cbf07b76)
- [https://git.kernel.org/stable/c/3f04e6520d9a53adb1d1daf4dc5d31a60fc77d1f](https://git.kernel.org/stable/c/3f04e6520d9a53adb1d1daf4dc5d31a60fc77d1f)
- [https://git.kernel.org/stable/c/44b43ec132f1cf3275ecc182d0c82f50c3c4c3d5](https://git.kernel.org/stable/c/44b43ec132f1cf3275ecc182d0c82f50c3c4c3d5)
- [https://git.kernel.org/stable/c/94380ecd5ff9b2a2b9f6e8a0b5c465159ccfaf71](https://git.kernel.org/stable/c/94380ecd5ff9b2a2b9f6e8a0b5c465159ccfaf71)
- [https://git.kernel.org/stable/c/94f3d399c1ddba763c1c5a6501f7375d533d789f](https://git.kernel.org/stable/c/94f3d399c1ddba763c1c5a6501f7375d533d789f)
- [https://git.kernel.org/stable/c/9757367bcf1d5d2c50b94d005abca21f3eedd7c3](https://git.kernel.org/stable/c/9757367bcf1d5d2c50b94d005abca21f3eedd7c3)

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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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