CVE-2026-98899: netfilter: ipset: mark the rcu locked areas properly

CVE-2026-98899: netfilter: ipset: mark the rcu locked areas properly

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: mark the rcu locked areas properly

When we bump the uref counter, there's no need to keep
the rcu lock because the referred hash table can't
disappear. Also, from the same reason in mtype_gc we
need the rcu lock and not a spinlock.

The Linux kernel CVE team has assigned CVE-2026-98899 to this issue.


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

	Fixed in 5.10.271 with commit 67bd3d2350d17c2f4fb158c3f917c10b15ecbc94
	Fixed in 5.15.222 with commit 892399abd1a005a455d5b74d86d82b9773405f2b
	Fixed in 6.1.189 with commit eee5172741b2c0e73210020732043e5d589295d3
	Fixed in 6.6.158 with commit ecb48c6b9edc78de8dd456c365727ae14b88c1ee
	Fixed in 6.12.111 with commit 0c46c9ce24130657ec7460c27fba5d445f5abd06
	Fixed in 6.18.53 with commit ca9fab1ca15534cef1630e81a479e94b3bbcdb6a
	Fixed in 7.2 with commit 5d0c22e73656d050daffad10a2ba8765ce8441c8

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-2026-98899
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:
	net/netfilter/ipset/ip_set_hash_gen.h


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/67bd3d2350d17c2f4fb158c3f917c10b15ecbc94
	https://git.kernel.org/stable/c/892399abd1a005a455d5b74d86d82b9773405f2b
	https://git.kernel.org/stable/c/eee5172741b2c0e73210020732043e5d589295d3
	https://git.kernel.org/stable/c/ecb48c6b9edc78de8dd456c365727ae14b88c1ee
	https://git.kernel.org/stable/c/0c46c9ce24130657ec7460c27fba5d445f5abd06
	https://git.kernel.org/stable/c/ca9fab1ca15534cef1630e81a479e94b3bbcdb6a
	https://git.kernel.org/stable/c/5d0c22e73656d050daffad10a2ba8765ce8441c8