linux-cve-announce - CVE-2023-52983: block, bfq: fix uaf for bfqq in bic_set

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Message-ID: <2025032706-CVE-2023-52983-4a16@gregkh>
Date: Thu, 27 Mar 2025 17:43:30 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52983: block, bfq: fix uaf for bfqq in bic_set_bfqq()

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

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

block, bfq: fix uaf for bfqq in bic_set_bfqq()

After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"),
bic->bfqq will be accessed in bic_set_bfqq(), however, in some context
bic->bfqq will be freed, and bic_set_bfqq() is called with the freed
bic->bfqq.

Fix the problem by always freeing bfqq after bic_set_bfqq().

The Linux kernel CVE team has assigned CVE-2023-52983 to this issue.


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

	Issue introduced in 5.15.86 with commit 094f3d9314d67691cb21ba091c1b528f6e3c4893 and fixed in 5.15.93 with commit 511c922c5bf6c8a166bea826e702336bc2424140
	Issue introduced in 6.1.2 with commit 761564d93c8265f65543acf0a576b32d66bfa26a and fixed in 6.1.11 with commit cb1876fc33af26d00efdd473311f1b664c77c44e
	Issue introduced in 6.0.16 with commit b22fd72bfebda3956efc4431b60ddfc0a51e03e0

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-2023-52983
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:
	block/bfq-cgroup.c
	block/bfq-iosched.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/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
	https://git.kernel.org/stable/c/511c922c5bf6c8a166bea826e702336bc2424140
	https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e
	https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2