Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-15T00:00:00 kernel: tracing/osnoise: Call synchronize_rcu() when unregistering 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-825

In the Linux kernel, the following vulnerability has been resolved: tracing/osnoise: Call synchronize_rcu() when unregistering This ensures that any RCU readers traversing the instance list have finished, before releasing the reference on the tracer that the instance points to.

A flaw was found in the Linux kernel's tracing/osnoise component. When unregistering a tracer instance, the system failed to call `synchronize_rcu()`, a mechanism for synchronizing read-copy-update (RCU) operations. This oversight could allow RCU readers to access memory that has already been freed, potentially leading to a use-after-free vulnerability. A local attacker could exploit this to cause a denial of service or potentially achieve arbitrary code execution.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-72012 https://nvd.nist.gov/vuln/detail/CVE-2026-72012 https://lore.kernel.org/linux-cve-announce/2026081508-CVE-2026-72012-db27@gregkh/T