---
title: "CVE-2026-90043: Linux kernel zram - Broken Access Control"
description: "Linux kernel zram contains a broken access control caused by incorrect slot lock bit position on big-endian 64-bit systems, letting concurrent CPUs cause lock state corruption, exploit requires specific architecture and configuration."
url: https://panop.io/threat-heartbeat/CVE-2026-90043/
---

# CVE-2026-90043 Linux kernel zram - Broken Access Control

Linux kernel zram contains a broken access control caused by incorrect slot lock bit position on big-endian 64-bit systems, letting concurrent CPUs cause lock state corruption, exploit requires specific architecture and configuration.

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-2026-90043)

## Details

Type

Broken Access Control

Impact

Denial Of Service, Data Tampering

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 fixed Linux kernel version that corrects slot lock bit position on big-endian 64-bit systems.

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-2026-90043](https://nvd.nist.gov/vuln/detail/CVE-2026-90043)
- [https://git.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11](https://git.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11)
- [https://git.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4](https://git.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4)

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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

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

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