CVE-2026-74602
Received Received - Intake

Buffer Overflow in Linux Kernel Ring Buffer

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order).

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74602
EUVD
EUVD-2026-64539

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's reader page order is not initialized properly. Specifically, bpage->order is left as 0 instead of being set to the actual allocation size (buffer::subbuf_order). This can cause issues when freeing the buffer if sub-buffers are larger than PAGE_SIZE.

Detection Guidance

This vulnerability is specific to the Linux kernel's ring-buffer implementation and does not have a direct network detection method. You can check your kernel version and ring-buffer configuration using commands like 'uname -a' and examining kernel logs for related errors.

Impact Analysis

If exploited, this could lead to memory corruption or crashes in systems using the affected Linux kernel. It may cause instability or denial of service in systems relying on ring-buffer functionality.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. Monitor kernel logs for ring-buffer related errors and ensure proper buffer allocation settings are applied.

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