linux-cve-announce - CVE-2022-49053: scsi: target: tcmu: Fix possible page UAF

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Message-ID: <2025022652-CVE-2022-49053-a1fe@gregkh>
Date: Wed, 26 Feb 2025 02:54:18 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49053: scsi: target: tcmu: Fix possible page UAF

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

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

scsi: target: tcmu: Fix possible page UAF

tcmu_try_get_data_page() looks up pages under cmdr_lock, but it does not
take refcount properly and just returns page pointer. When
tcmu_try_get_data_page() returns, the returned page may have been freed by
tcmu_blocks_release().

We need to get_page() under cmdr_lock to avoid concurrent
tcmu_blocks_release().

The Linux kernel CVE team has assigned CVE-2022-49053 to this issue.


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

	Fixed in 4.14.276 with commit d7c5d79e50be6e06b669141e3db1f977a0dd4e8e
	Fixed in 4.19.239 with commit e3e0e067d5b34e4a68e3cc55f8eebc413f56f8ed
	Fixed in 5.4.190 with commit fb7a5115422fbd6a4d505e8844f1ef5529f10489
	Fixed in 5.10.112 with commit aec36b98a1bbaa84bfd8299a306e4c12314af626
	Fixed in 5.15.35 with commit b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322
	Fixed in 5.17.4 with commit a9564d84ed9f6ee71017d062d0d2182154294a4b
	Fixed in 5.18 with commit a6968f7a367f128d120447360734344d5a3d5336

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-2022-49053
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:
	drivers/target/target_core_user.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/d7c5d79e50be6e06b669141e3db1f977a0dd4e8e
	https://git.kernel.org/stable/c/e3e0e067d5b34e4a68e3cc55f8eebc413f56f8ed
	https://git.kernel.org/stable/c/fb7a5115422fbd6a4d505e8844f1ef5529f10489
	https://git.kernel.org/stable/c/aec36b98a1bbaa84bfd8299a306e4c12314af626
	https://git.kernel.org/stable/c/b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322
	https://git.kernel.org/stable/c/a9564d84ed9f6ee71017d062d0d2182154294a4b
	https://git.kernel.org/stable/c/a6968f7a367f128d120447360734344d5a3d5336