---
title: "CVE-2026-90325: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in blk-cgroup during IO scheduler switching caused by a race condition in blkcg_activate_policy(), letting attackers cause memory corruption, exploit requires concurrent blkcg deletion."
url: https://panop.io/threat-heartbeat/CVE-2026-90325/
---

# CVE-2026-90325 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in blk-cgroup during IO scheduler switching caused by a race condition in blkcg\_activate\_policy(), letting attackers cause memory corruption, exploit requires concurrent blkcg deletion.

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-2026-90325)

## Details

Type

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

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for blk-cgroup use-after-free.

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-2026-90325](https://nvd.nist.gov/vuln/detail/CVE-2026-90325)
- [https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df](https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df)
- [https://git.kernel.org/stable/c/1a267295b1ea6a6477963f3fda84adfecd48fcad](https://git.kernel.org/stable/c/1a267295b1ea6a6477963f3fda84adfecd48fcad)
- [https://git.kernel.org/stable/c/3d8c3da95c75a4d312e272fc7b4076dd3ba9115c](https://git.kernel.org/stable/c/3d8c3da95c75a4d312e272fc7b4076dd3ba9115c)
- [https://git.kernel.org/stable/c/5e9220389920f33b6a804d50c548cd0cd1b04634](https://git.kernel.org/stable/c/5e9220389920f33b6a804d50c548cd0cd1b04634)
- [https://git.kernel.org/stable/c/7337d012ca3fc3a6a2d1c8e2a19c6d97c38b410d](https://git.kernel.org/stable/c/7337d012ca3fc3a6a2d1c8e2a19c6d97c38b410d)
- [https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc](https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc)
- [https://git.kernel.org/stable/c/d8c872901e6459339374e9eea80aa919176c2ccd](https://git.kernel.org/stable/c/d8c872901e6459339374e9eea80aa919176c2ccd)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)