SB20260912279 - Race condition in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89501)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a race condition involving cpu_buffer->free_page.

The vulnerability exists due to improper synchronization in trace ring buffer resizing when changing a sub-buffer order. A local user can race sub-buffer resizing with read-page allocation or freeing operations to cause a race condition involving cpu_buffer->free_page.

Remediation

Install update from vendor's website.

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