Linux Kernel up to 5.6.4 block/bfq-iosched.c bfq_idle_slice_timer_body use after free

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

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.6.4. It has been classified as critical. Affected is the function bfq_idle_slice_timer_body of the file block/bfq-iosched.c. This manipulation causes use after free. This vulnerability is tracked as CVE-2020-12657. The attack is restricted to local execution. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.6.4 (Operating System). Affected by this vulnerability is the function bfq_idle_slice_timer_body of the file block/bfq-iosched.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

The weakness was disclosed 05/05/2020. This vulnerability is known as CVE-2020-12657 since 05/05/2020. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.6.5 eliminates this vulnerability.

The entries VDB-154748, VDB-154746, VDB-154745 and VDB-154744 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.6.5

Timelineinfo

05/05/2020 🔍
05/05/2020 +0 days 🔍
05/05/2020 +0 days 🔍
10/15/2020 +163 days 🔍

Sourcesinfo

Vendor: kernel.org

Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-12657 (🔍)
GCVE (CVE): GCVE-0-2020-12657
GCVE (VulDB): GCVE-100-154747
See also: 🔍

Entryinfo

Created: 05/05/2020 20:35
Updated: 10/15/2020 11:28
Changes: 05/05/2020 20:35 (40), 05/05/2020 20:40 (18), 10/15/2020 11:28 (1)
Complete: 🔍
Cache ID: 216::103

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