CVE-2026-64005: net/smc: Do not re-initialize smc hashtables

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

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

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

net/smc: Do not re-initialize smc hashtables

INIT_HLIST_HEAD(&smc_v*_hashinfo.ht) are called after smc_nl_init(),
proto_register() and sock_register(). This can lead to smc_v*_hashinfo.ht
being reset even though hash entries already exist and are being used,
possibly resulting in a corrupted list.

Remove unnecessary and dangerous re-initialisation of smc_v*_hashinfo.ht in
smc_init(); it is implicitly initialised to zero anyhow. Add
HLIST_HEAD_INIT to the definitions for clarity.

The Linux kernel CVE team has assigned CVE-2026-64005 to this issue.


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

	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 5.10.259 with commit cdc79c05cc375f68ae87b0c74fdaac1a5c93155a
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 5.15.210 with commit 2006605006e5a4a11d93e1ebdbbe95764d24276f
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 6.1.176 with commit 64c96e497d5ada0b90e99bf58f893aa2b73dcfbc
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 6.6.143 with commit ed7a758313011885347b854e97cb95903ef3c3f7
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 6.12.93 with commit 0cc9d0ac22d02f1ba1884de5d6de9eaf8b45d82d
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 6.18.35 with commit 55cba6b883b41e5922c00ba9d4e3262131f46f1b
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 7.0.12 with commit 5ec939367e700722ffbb1b7cacccbb1a3cf0ebd1
	Issue introduced in 4.11 with commit f16a7dd5cf27eeda187425c9c7d96802a549f9c4 and fixed in 7.1 with commit 9e4389b0038781f19f97895186ed941ff8ac1678

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-2026-64005
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/smc/af_smc.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/cdc79c05cc375f68ae87b0c74fdaac1a5c93155a
	https://git.kernel.org/stable/c/2006605006e5a4a11d93e1ebdbbe95764d24276f
	https://git.kernel.org/stable/c/64c96e497d5ada0b90e99bf58f893aa2b73dcfbc
	https://git.kernel.org/stable/c/ed7a758313011885347b854e97cb95903ef3c3f7
	https://git.kernel.org/stable/c/0cc9d0ac22d02f1ba1884de5d6de9eaf8b45d82d
	https://git.kernel.org/stable/c/55cba6b883b41e5922c00ba9d4e3262131f46f1b
	https://git.kernel.org/stable/c/5ec939367e700722ffbb1b7cacccbb1a3cf0ebd1
	https://git.kernel.org/stable/c/9e4389b0038781f19f97895186ed941ff8ac1678