CVE-2026-97617
Received Received - Intake

Buffer Overflow in Linux Kernel ring-buffer

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check resize_disabled before publishing the new subbuf order ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA. Check the CPUs before storing the new order.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-10-15
AI Q&A
2026-09-25
EPSS Evaluated
2026-10-14
NVD
CVE-2026-97617
EUVD
EUVD-2026-86748

Affected Vendors & Products

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

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a race condition in the Linux kernel's ring buffer implementation. The vulnerability occurs when the kernel attempts to resize a ring buffer while another process is mapping it. The kernel checks for active resizing operations after storing the new size, allowing a race where a user can map the buffer with an incorrect size, leading to memory corruption or crashes.

Impact Analysis

This vulnerability could cause system instability, crashes, or potential privilege escalation if exploited. Users running affected Linux kernel versions may experience unexpected behavior, data corruption, or denial of service.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a low-level Linux kernel issue related to memory mapping and buffer resizing, which does not involve data exposure, unauthorized access, or privacy violations typically addressed by these regulations.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve this ring-buffer vulnerability. Monitor kernel updates from your distribution vendor and apply them promptly.

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