linux-cve-announce - CVE-2022-49921: net: sched: Fix use after free in red

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Message-ID: <2025050108-CVE-2022-49921-e4fc@gregkh>
Date: Thu,  1 May 2025 16:11:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49921: net: sched: Fix use after free in red_enqueue()

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

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

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

net: sched: Fix use after free in red_enqueue()

We can't use "skb" again after passing it to qdisc_enqueue().  This is
basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb
len before calling child enqueue").

The Linux kernel CVE team has assigned CVE-2022-49921 to this issue.


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

	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 4.9.333 with commit 795afe0b9bb6c915f0299a8e309936519be01619
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 4.14.299 with commit a238cdcf2bdc72207c74375fc8be13ee549ca9db
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 4.19.265 with commit e877f8fa49fbccc63cb2df2e9179bddc695b825a
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 5.4.224 with commit 52e0429471976785c155bfbf51d80990c6cd46e2
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 5.10.154 with commit 5960b9081baca85cc7dcb14aec1de85999ea9d36
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 5.15.78 with commit fc4b50adb400ee5ec527a04073174e8e73a139fa
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 6.0.8 with commit 170e5317042c302777ed6d59fdb84af9b0219d4e
	Issue introduced in 4.7 with commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e and fixed in 6.1 with commit 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
	Issue introduced in 4.4.163 with commit ab0b3b9dbf559a5633d460e748144697bd2d3aa3

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-2022-49921
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/sched/sch_red.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/795afe0b9bb6c915f0299a8e309936519be01619
	https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db
	https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a
	https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2
	https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36
	https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa
	https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e
	https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9