---
title: "CVE-2026-90326: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by a race condition between blkcg_activate_policy() and concurrent blkcg deletion in blk-cgroup, letting attackers trigger memory corruption during IO scheduler switching, exploit requires concurrent blkcg deletion and policy activation."
url: https://panop.io/threat-heartbeat/CVE-2026-90326/
---

# CVE-2026-90326 Linux Kernel - Use After Free

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

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90326)

## 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

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for blk-cgroup race conditions.

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-2026-90326](https://nvd.nist.gov/vuln/detail/CVE-2026-90326)
- [https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc](https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc)
- [https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df](https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df)
- [https://git.kernel.org/stable/c/2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd](https://git.kernel.org/stable/c/2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd)
- [https://git.kernel.org/stable/c/5313d4d41739b0cb63000747c97bb1217ac45f3e](https://git.kernel.org/stable/c/5313d4d41739b0cb63000747c97bb1217ac45f3e)
- [https://git.kernel.org/stable/c/ac34e655dffa74349d885a43d098115336f53842](https://git.kernel.org/stable/c/ac34e655dffa74349d885a43d098115336f53842)

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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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