linux-cve-announce - CVE-2022-49911: netfilter: ipset: enforce documented limit to prevent allocating huge memory

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Message-ID: <2025050105-CVE-2022-49911-2e28@gregkh>
Date: Thu,  1 May 2025 16:11:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49911: netfilter: ipset: enforce documented limit to prevent allocating huge memory

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

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

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

netfilter: ipset: enforce documented limit to prevent allocating huge memory

Daniel Xu reported that the hash:net,iface type of the ipset subsystem does
not limit adding the same network with different interfaces to a set, which
can lead to huge memory usage or allocation failure.

The quick reproducer is

$ ipset create ACL.IN.ALL_PERMIT hash:net,iface hashsize 1048576 timeout 0
$ for i in $(seq 0 100); do /sbin/ipset add ACL.IN.ALL_PERMIT 0.0.0.0/0,kaf_$i timeout 0 -exist; done

The backtrace when vmalloc fails:

        [Tue Oct 25 00:13:08 2022] ipset: vmalloc error: size 1073741848, exceeds total pages
        <...>
        [Tue Oct 25 00:13:08 2022] Call Trace:
        [Tue Oct 25 00:13:08 2022]  <TASK>
        [Tue Oct 25 00:13:08 2022]  dump_stack_lvl+0x48/0x60
        [Tue Oct 25 00:13:08 2022]  warn_alloc+0x155/0x180
        [Tue Oct 25 00:13:08 2022]  __vmalloc_node_range+0x72a/0x760
        [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_add+0x7c0/0xb20
        [Tue Oct 25 00:13:08 2022]  ? __kmalloc_large_node+0x4a/0x90
        [Tue Oct 25 00:13:08 2022]  kvmalloc_node+0xa6/0xd0
        [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_resize+0x99/0x710
        <...>

The fix is to enforce the limit documented in the ipset(8) manpage:

>  The internal restriction of the hash:net,iface set type is that the same
>  network prefix cannot be stored with more than 64 different interfaces
>  in a single set.

The Linux kernel CVE team has assigned CVE-2022-49911 to this issue.


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

	Issue introduced in 5.11 with commit ccf0a4b7fc688561428290265e4effde41446668 and fixed in 5.15.78 with commit 42d20d5e24575c9afa2d66d9a51e7386db9514f5
	Issue introduced in 5.11 with commit ccf0a4b7fc688561428290265e4effde41446668 and fixed in 6.0.8 with commit a37ef32fe5956fe9248df68f6a61997845ba047e
	Issue introduced in 5.11 with commit ccf0a4b7fc688561428290265e4effde41446668 and fixed in 6.1 with commit 510841da1fcc16f702440ab58ef0b4d82a9056b7

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-2022-49911
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/42d20d5e24575c9afa2d66d9a51e7386db9514f5
	https://git.kernel.org/stable/c/a37ef32fe5956fe9248df68f6a61997845ba047e
	https://git.kernel.org/stable/c/510841da1fcc16f702440ab58ef0b4d82a9056b7