CVE-2026-89716

Received Received - Intake

zram: Validate Deflate Parameters in Linux Kernel

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: zram: validate deflate params We must validate user-supplied deflate winbits before we pass it to zlib_deflate_workspacesize(), which triggers BUG_ON() if winbits value is outside of valid ranges.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-11

Last Modified

2026-09-11

Generated

2026-09-12

AI Q&A

2026-09-12

EPSS Evaluated

N/A

NVD

CVE-2026-89716

EUVD

EUVD-2026-76628

Affected Vendors & Products

Vendor	Product	Version / Range
linux_kernel	zram	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves improper validation of user-supplied deflate winbits parameters in the zram module. The issue occurs when these parameters are passed to zlib_deflate_workspacesize() without proper checks, potentially triggering a BUG_ON() condition if the winbits value is outside valid ranges.

Detection Guidance

This vulnerability can be detected by checking the Linux kernel version and verifying if it is affected. Use the command 'uname -r' to check the kernel version. If the version is below the patched release, the system may be vulnerable.

Impact Analysis

This vulnerability could lead to system crashes or instability if an attacker exploits it to trigger a BUG_ON() condition in the Linux kernel. It primarily affects systems using the zram compression module.

Mitigation Strategies

Immediately update the Linux kernel to the latest patched version. Use your package manager to apply updates, e.g., 'sudo apt update && sudo apt upgrade' for Debian-based systems or 'sudo yum update' for RHEL-based systems.

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