CVE-2026-98057

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Persistent Ring Buffer Validation Flaw in Linux Kernel

Publication date: 2026-09-25

Last updated on: 2026-10-15

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Add checking nr_subbufs to persistent ring buffer validation Sashiko reported that the code was using meta->nr_subbufs without making sure that it matched the nr_pages + 1 on data that was assuming the two were the same. Add a check to the persistent ring buffer validation code to make sure that the saved nr_subbufs matches what we expect.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-25

Last Modified

2026-10-15

Generated

2026-10-15

AI Q&A

2026-09-25

EPSS Evaluated

2026-10-14

NVD

CVE-2026-98057

EUVD

EUVD-2026-86710

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a missing validation check in the persistent ring buffer code. The issue occurs when the code uses meta->nr_subbufs without verifying it matches the expected nr_pages + 1 value. This mismatch could lead to incorrect buffer handling or potential data corruption.

Detection Guidance

This vulnerability is specific to the Linux kernel's ring-buffer implementation and requires kernel-level inspection. Detection involves checking kernel logs for ring-buffer validation errors or verifying the nr_subbufs parameter in persistent ring buffer configurations. Use commands like dmesg | grep ring-buffer or check /proc/kmsg for related errors.

Impact Analysis

If exploited, this vulnerability could allow an attacker to cause system instability, data corruption, or denial of service by manipulating ring buffer operations. Systems relying on persistent ring buffers for logging or data processing may be affected.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it pertains to a low-level Linux kernel ring-buffer validation issue. No evidence suggests data exposure or privacy risks that would impact regulatory compliance.

Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Update your system using your package manager (e.g., apt upgrade linux-image-generic or yum update kernel). Reboot the system after applying the patch to ensure the updated kernel is active.

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