What’s Vulnerable › Vulnerabilities

CVE-2026-89501: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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 kernel: 6.8 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d
• https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2
• https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2
• https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc

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