Linux Kernel up to 4.18.6 block/blk-core.c __blk_drain_queue use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.18.6. This affects the function __blk_drain_queue of the file block/blk-core.c. The manipulation leads to use after free. This vulnerability is traded as CVE-2018-20856. An attack has to be approached locally. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.18.6 (Operating System) and classified as critical. This issue affects the function __blk_drain_queue of the file block/blk-core.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

The weakness was shared 07/26/2019 (Website). It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2018-20856 since 07/26/2019. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.18.7 eliminates this vulnerability.

The entries VDB-137406, VDB-138837, VDB-138838 and VDB-138853 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

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 4.18.7
Patch: git.kernel.org

Timelineinfo

07/26/2019 🔍
07/26/2019 +0 days 🔍
07/26/2019 +0 days 🔍
11/13/2023 +1571 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:3055
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-20856 (🔍)
GCVE (CVE): GCVE-0-2018-20856
GCVE (VulDB): GCVE-100-138839
See also: 🔍

Entryinfo

Created: 07/26/2019 14:40
Updated: 11/13/2023 08:54
Changes: 07/26/2019 14:40 (44), 07/13/2020 09:40 (2), 11/13/2023 08:51 (3), 11/13/2023 08:54 (18)
Complete: 🔍
Cache ID: 216::103

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

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