linux-cve-announce - CVE-2024-50258: net: fix crash when config small gso_max_size/gso_ipv4_max

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Message-ID: <2024110939-CVE-2024-50258-1b4c@gregkh>
Date: Sat,  9 Nov 2024 11:16:06 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50258: net: fix crash when config small gso_max_size/gso_ipv4_max_size

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

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

net: fix crash when config small gso_max_size/gso_ipv4_max_size

Config a small gso_max_size/gso_ipv4_max_size will lead to an underflow
in sk_dst_gso_max_size(), which may trigger a BUG_ON crash,
because sk->sk_gso_max_size would be much bigger than device limits.
Call Trace:
tcp_write_xmit
    tso_segs = tcp_init_tso_segs(skb, mss_now);
        tcp_set_skb_tso_segs
            tcp_skb_pcount_set
                // skb->len = 524288, mss_now = 8
                // u16 tso_segs = 524288/8 = 65535 -> 0
                tso_segs = DIV_ROUND_UP(skb->len, mss_now)
    BUG_ON(!tso_segs)
Add check for the minimum value of gso_max_size and gso_ipv4_max_size.

The Linux kernel CVE team has assigned CVE-2024-50258 to this issue.


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

	Issue introduced in 4.16 with commit 46e6b992c250 and fixed in 6.6.60 with commit ac5977001eee
	Issue introduced in 4.16 with commit 46e6b992c250 and fixed in 6.11.7 with commit e72fd1389a53
	Issue introduced in 4.16 with commit 46e6b992c250 and fixed in 6.12-rc6 with commit 9ab5cf19fb0e

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-2024-50258
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/core/rtnetlink.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/ac5977001eee7660c643f8e07a2de9001990b7b8
	https://git.kernel.org/stable/c/e72fd1389a5364bc6aa6312ecf30bdb5891b9486
	https://git.kernel.org/stable/c/9ab5cf19fb0e4680f95e506d6c544259bf1111c4