Linux Kernel up to 4.4.0 Paging Structure Access arch/x86/mm/tlb.c race condition

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.4.0. Affected by this vulnerability is an unknown functionality of the file arch/x86/mm/tlb.c of the component Paging Structure Access Handler. This manipulation causes race condition. This vulnerability is handled as CVE-2016-2069. It is possible to launch the attack on the local host. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.4.0 (Operating System). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file arch/x86/mm/tlb.c of the component Paging Structure Access Handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Race condition in arch/x86/mm/tlb.c in the Linux kernel before 4.4.1 allows local users to gain privileges by triggering access to a paging structure by a different CPU.

The weakness was released 04/27/2016 by Andy Lutomirski (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2016-2069 since 01/25/2016. Attacking locally is a requirement. The successful exploitation needs a single authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 88600 (Debian DLA-412-1 : linux-2.6 security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157314 (Oracle Enterprise Linux Security Update for kernel (ELSA-2016-2574)-Deprecated).

Upgrading to version 4.4.1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (88600) and SecurityFocus (BID 81809†). Entries connected to this vulnerability are available at VDB-80804, VDB-82953, VDB-82963 and VDB-82965. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.4
VulDB Temp Score: 7.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 88600
Nessus Name: Debian DLA-412-1 : linux-2.6 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703503
OpenVAS Name: Debian Security Advisory DSA 3503-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.4.1
Patch: git.kernel.org

Timelineinfo

01/23/2016 🔍
01/25/2016 +2 days 🔍
02/05/2016 +11 days 🔍
02/07/2016 +2 days 🔍
04/27/2016 +79 days 🔍
04/27/2016 +0 days 🔍
04/28/2016 +1 days 🔍
07/27/2022 +2281 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2931-1
Researcher: Andy Lutomirski
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2069 (🔍)
GCVE (CVE): GCVE-0-2016-2069
GCVE (VulDB): GCVE-100-82951

OVAL: 🔍

SecurityFocus: 81809 - Linux Kernel CVE-2016-2069 TLB Flush Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 04/28/2016 10:23
Updated: 07/27/2022 07:37
Changes: 04/28/2016 10:23 (62), 10/29/2018 05:48 (20), 07/27/2022 07:32 (5), 07/27/2022 07:37 (1)
Complete: 🔍
Cache ID: 216:2B2:103

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