# CVE-2026-89501

## Summary

- **CVE ID:** CVE-2026-89501
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Because, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page,
hold cpu_buffer->lock to prevent races with
ring_buffer_alloc_read_page() and ring_buffer_free_read_page().

## Affected Products

- Linux — Linux (8e7b58c27b3c567316a51079b375b846f9223bba)
- Linux — Linux (6.8)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2)
- [CNA](https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2)
- [CNA](https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc)
- [CNA](https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._