SB20261022129 - Race condition in Linux kernel events

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98552)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to leak kernel resources, potentially causing a denial of service.

The vulnerability exists due to a race condition in the Linux kernel perf context attachment logic when global and non-global context attachments occur concurrently. A local user can trigger competing attachment operations that increment a reference count without setting the global flag, causing subsequent global detachment to skip the corresponding task context cleanup and potentially exhaust kernel resources.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/23250517cd475367653f1e99396967f54c6f1b7c
• https://git.kernel.org/stable/c/5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72
• https://git.kernel.org/stable/c/cca4980630b3c7a85f53cb43c6018184ce5d4e37