CVE-2026-72012: tracing/osnoise: Call synchronize_rcu() when unregistering

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2026-72012 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.17 with commit a6ed2aee54644cfa2d04ca86308767f5c3a087e8 and fixed in 6.6.145 with commit 3c693635bb7b3a9b6645831a84fed2af46cdf249
	Issue introduced in 5.17 with commit a6ed2aee54644cfa2d04ca86308767f5c3a087e8 and fixed in 6.12.97 with commit 38366140dc8ee3568c7f0191d517e117963bd580
	Issue introduced in 5.17 with commit a6ed2aee54644cfa2d04ca86308767f5c3a087e8 and fixed in 6.18.40 with commit fad36954b29592ce463254179c3043697678481f
	Issue introduced in 5.17 with commit a6ed2aee54644cfa2d04ca86308767f5c3a087e8 and fixed in 7.1.5 with commit dd0160a0842337f12e7694d68b184050afc6d3a4
	Issue introduced in 5.17 with commit a6ed2aee54644cfa2d04ca86308767f5c3a087e8 and fixed in 7.2-rc3 with commit fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-72012
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	kernel/trace/trace_osnoise.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/3c693635bb7b3a9b6645831a84fed2af46cdf249
	https://git.kernel.org/stable/c/38366140dc8ee3568c7f0191d517e117963bd580
	https://git.kernel.org/stable/c/fad36954b29592ce463254179c3043697678481f
	https://git.kernel.org/stable/c/dd0160a0842337f12e7694d68b184050afc6d3a4
	https://git.kernel.org/stable/c/fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a