CVE-2026-64598: smb/client: Fix error code in smb2_aead_req_alloc()

CVE-2026-64598: smb/client: Fix error code in smb2_aead_req_alloc()

[Greg Kroah-Hartman]

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

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

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

smb/client: Fix error code in smb2_aead_req_alloc()

The "*num_sgs" variable is a u32 so "ERR_PTR(*num_sgs)" doesn't work.
We would have to do something similar to the previous line where it's
cast to int and then long.  However, it's simpler to store the return in
an int ret variable.

This bug would eventually result in a crash when dereference the invalid
error pointer.

The Linux kernel CVE team has assigned CVE-2026-64598 to this issue.


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

	Issue introduced in 6.3 with commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 and fixed in 6.6.145 with commit aa37f5fef78dd11cbf983269da2031e12625c56d
	Issue introduced in 6.3 with commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 and fixed in 6.12.96 with commit cad756733dc3985188983f3e2eb77e2927209099
	Issue introduced in 6.3 with commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 and fixed in 6.18.39 with commit a187883cc1dc784a4d32537f5d316f1b7b9ad76f
	Issue introduced in 6.3 with commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 and fixed in 7.1.4 with commit a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac
	Issue introduced in 6.3 with commit d08089f649a0cfb2099c8551ac47eef0cc23fdf2 and fixed in 7.2-rc1 with commit 61f28012e5650c619223decdb7970e0d3162e949

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-2026-64598
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:
	fs/smb/client/smb2ops.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/aa37f5fef78dd11cbf983269da2031e12625c56d
	https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099
	https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f
	https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac
	https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949