linux-cve-announce - CVE-2022-49770: ceph: avoid putting the realm twice when decoding snaps fails

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Message-ID: <2025050115-CVE-2022-49770-0b74@gregkh>
Date: Thu,  1 May 2025 16:09:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49770: ceph: avoid putting the realm twice when decoding snaps fails

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

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

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

ceph: avoid putting the realm twice when decoding snaps fails

When decoding the snaps fails it maybe leaving the 'first_realm'
and 'realm' pointing to the same snaprealm memory. And then it'll
put it twice and could cause random use-after-free, BUG_ON, etc
issues.

The Linux kernel CVE team has assigned CVE-2022-49770 to this issue.


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

	Fixed in 4.19.268 with commit 274e4c79a3a2a24fba7cfe0e41113f1138785c37
	Fixed in 5.4.226 with commit cb7495fe957526555782ce0723f79ce92a6db22e
	Fixed in 5.10.157 with commit 044bc6d3c2c0e9090b0841e7b723875756534b45
	Fixed in 5.15.81 with commit 2f6e2de3a5289004650118b61f138fe7c28e1905
	Fixed in 6.0.10 with commit fd879c83e87735ab8f00ef7755752cf0cbae24b2
	Fixed in 6.1 with commit 51884d153f7ec85e18d607b2467820a90e0f4359

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-2022-49770
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/ceph/snap.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/274e4c79a3a2a24fba7cfe0e41113f1138785c37
	https://git.kernel.org/stable/c/cb7495fe957526555782ce0723f79ce92a6db22e
	https://git.kernel.org/stable/c/044bc6d3c2c0e9090b0841e7b723875756534b45
	https://git.kernel.org/stable/c/2f6e2de3a5289004650118b61f138fe7c28e1905
	https://git.kernel.org/stable/c/fd879c83e87735ab8f00ef7755752cf0cbae24b2
	https://git.kernel.org/stable/c/51884d153f7ec85e18d607b2467820a90e0f4359