Bug 2033723 (CVE-2021-0961) - CVE-2021-0961 kernel: there is a possible way to read kernel memory due to uninitialized data in quota_proc_write() in xt_quota2.c
Summary: CVE-2021-0961 kernel: there is a possible way to read kernel memory due to un...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-0961
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2033724
Blocks: 2033725
TreeView+ depends on / blocked
 
Reported: 2021-12-17 17:18 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-01-04 21:29 UTC (History)
48 users (show)

Fixed In Version:
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An uninitialized data read flaw in the Linux kernel Android enhanced xt_quota that can count upwards and in packets functionality was found in the way user calls function quota_proc_write. A local user could use this flaw to get unauthorized data access.
Clone Of:
Environment:
Last Closed: 2021-12-23 14:52:56 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-12-17 17:18:01 UTC 
In quota_proc_write of xt_quota2.c, there is a possible way to read kernel memory due to uninitialized data. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196046570References: Upstream kernel

References:
https://source.android.com/security/bulletin/2021-12-01

Upstream patches:
https://android.googlesource.com/kernel/common/+/e113eb454e92
https://android.googlesource.com/kernel/common/+/60a4c35570d9
https://android.googlesource.com/kernel/common/+/4b05a506bda0
Comment 1 Guilherme de Almeida Suckevicz 2021-12-17 17:18:55 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2033724]
Comment 2 Justin M. Forbes 2021-12-21 14:46:51 UTC 
xt_quota2.c is an android implementatation, not in the upstream kernel tree.  This code does not appear in the Fedora kernel at all.
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