Linux Kernel up to 5.4 fs/namei.c may_create_in_sticky use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 5.4. This vulnerability affects the function may_create_in_sticky of the file fs/namei.c. This manipulation causes use after free. This vulnerability is registered as CVE-2020-8428. The attack needs to be launched locally. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.4 (Operating System). It has been declared as critical. Affected by this vulnerability is the function may_create_in_sticky of the file fs/namei.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:

fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.

The weakness was published 01/29/2020 as CID-d0cb50185ae9 (oss-sec). It is possible to read the advisory at openwall.com. This vulnerability is known as CVE-2020-8428 since 01/28/2020. Attacking locally is a requirement. A single authentication is required for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.5 eliminates this vulnerability.

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Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

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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 5.5
Patch: git.kernel.org

Timelineinfo

01/28/2020 🔍
01/29/2020 +1 days 🔍
01/29/2020 +0 days 🔍
03/27/2024 +1519 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: CID-d0cb50185ae9
Status: Not defined

CVE: CVE-2020-8428 (🔍)
GCVE (CVE): GCVE-0-2020-8428
GCVE (VulDB): GCVE-100-149515

Entryinfo

Created: 01/29/2020 08:05
Updated: 03/27/2024 13:39
Changes: 01/29/2020 08:05 (42), 01/29/2020 08:10 (18), 03/27/2024 13:39 (18)
Complete: 🔍
Cache ID: 216::103

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