Linux Kernel up to 4.8.13 block/blk-map.c blk_rq_map_user_iov use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.8.13. The impacted element is the function blk_rq_map_user_iov of the file block/blk-map.c. Performing a manipulation results in use after free. This vulnerability is known as CVE-2016-9576. Attacking locally is a requirement. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.8.13 (Operating System). It has been classified as critical. This affects the function blk_rq_map_user_iov of the file block/blk-map.c. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.

The bug was discovered 12/28/2016. The weakness was published 12/28/2016 (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2016-9576 since 11/23/2016. The exploitability is told to be easy. Attacking locally is a requirement. Required for exploitation is a authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 900048 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276295 (Fedora Security Update for kernel (FEDORA-2016-107f03cc00)).

Upgrading to version 4.8.14 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (900048) and SecurityFocus (BID 94821†). Similar entries are available at VDB-94701 and VDB-94702. Be aware that VulDB is the high quality 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: 7.8
VulDB Meta Temp Score: 7.6

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 900048
Nessus File: 🔍

OpenVAS ID: 901079
OpenVAS Name: Fedora Update for kernel FEDORA-2016-107f03cc00
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 4.8.14
Patch: git.kernel.org

Timelineinfo

11/23/2016 🔍
11/25/2016 +2 days 🔍
12/28/2016 +33 days 🔍
12/28/2016 +0 days 🔍
12/28/2016 +0 days 🔍
12/28/2016 +0 days 🔍
10/12/2022 +2114 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2017:1842
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9576 (🔍)
GCVE (CVE): GCVE-0-2016-9576
GCVE (VulDB): GCVE-100-94695
SecurityFocus: 94821 - Linux Kernel CVE-2016-9576 Use After Free Memory Corruption Vulnerability

See also: 🔍

Entryinfo

Created: 12/28/2016 16:10
Updated: 10/12/2022 19:04
Changes: 12/28/2016 16:10 (71), 07/20/2019 08:57 (5), 10/12/2022 18:57 (4), 10/12/2022 19:04 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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