SB20260912281 - Race condition in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89503)

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 mismatch between reader-page metadata and allocated memory.

The vulnerability exists due to a race condition in ring_buffer_alloc_read_page() when resizing ring-buffer subbuffers while allocating a reader page. A local user can race reader-page allocation with a subbuffer-order change to cause a mismatch between reader-page metadata and allocated memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734
• https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678
• https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3