CVE-2026-89502
Received Received - Intake

Memory Corruption in Linux Kernel ring-buffer

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: ring-buffer: Free cpu_buffer::free_page with subbuf_order When sub-buffers use an order greater than 0, cpu_buffer->free_page is allocated with subbuf_order. Use the correct order for cpu_buffer->free_page.

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Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-10-02
AI Q&A
2026-09-11
EPSS Evaluated
2026-09-29
NVD
CVE-2026-89502
EUVD
EUVD-2026-76408

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability where the ring-buffer free page handling is incorrect when sub-buffers use an order greater than 0. The cpu_buffer->free_page is allocated with the wrong order, leading to potential memory management issues.

Detection Guidance

This vulnerability is specific to the Linux kernel's ring-buffer implementation. Detection requires checking the kernel version and whether the affected code path is present. Use uname -a to check your kernel version and grep for ring-buffer related modules or code in the kernel logs or source.

Impact Analysis

This vulnerability could cause system instability or crashes due to improper memory handling in the Linux kernel's ring-buffer. It may lead to data corruption or unexpected behavior in systems relying on this kernel component.

Mitigation Strategies

Apply the latest kernel update provided by your Linux distribution to patch this vulnerability. If an update is not yet available, consider temporarily disabling or restricting access to the affected ring-buffer functionality if feasible.

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