Linux Kernel ext4 race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel. Affected is an unknown function of the component ext4. The manipulation results in race condition. This vulnerability is cataloged as CVE-2015-8839. The attack must be initiated from a local position. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (version unknown). It has been classified as critical. Affected is an unknown function of the component ext4. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 04/01/2016 as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2015-8839 since 04/01/2016. The attack needs to be approached locally. The successful exploitation requires a authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 90656 (Fedora 23 : kernel-4.4.7-300.fc23 (2016-8e858f96b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276048 (Fedora Security Update for kernel (FEDORA-2016-8e858f96b8)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (90656), SecurityFocus (BID 85798†) and SecurityTracker (ID 1035455†). The entry VDB-91461 is related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.1
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: 90656
Nessus Name: Fedora 23 : kernel-4.4.7-300.fc23 (2016-8e858f96b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 830526
OpenVAS Name: Fedora Update for kernel FEDORA-2016-8
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

04/01/2016 🔍
04/01/2016 +0 days 🔍
04/01/2016 +0 days 🔍
04/01/2016 +0 days 🔍
04/04/2016 +3 days 🔍
04/19/2016 +14 days 🔍
04/22/2016 +3 days 🔍
05/02/2016 +10 days 🔍
07/12/2022 +2262 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2016-8e858f96b8
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-8839 (🔍)
GCVE (CVE): GCVE-0-2015-8839
GCVE (VulDB): GCVE-100-81564
SecurityFocus: 85798 - Linux Kernel CVE-2015-8839 Local Security Bypass Vulnerability
SecurityTracker: 1035455

See also: 🔍

Entryinfo

Created: 04/04/2016 11:33
Updated: 07/12/2022 07:14
Changes: 04/04/2016 11:33 (64), 09/21/2018 10:44 (20), 07/12/2022 06:54 (5), 07/12/2022 07:08 (1), 07/12/2022 07:14 (1)
Complete: 🔍
Cache ID: 216:126:103

Once again VulDB remains the best source for vulnerability data.

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