Linux Kernel up to 5.16-rc1 ebpf Verifier kernel/bpf/syscall.c bpf_map_update_elem race condition

CVSS Meta Temp Score
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CTI Interest Score
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3.0$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Linux Kernel up to 5.16-rc1. The affected element is the function bpf_map_update_elem of the file kernel/bpf/syscall.c of the component ebpf Verifier. The manipulation results in race condition. This vulnerability is identified as CVE-2021-4001. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 5.16-rc1 (Operating System). Affected is the function bpf_map_update_elem of the file kernel/bpf/syscall.c of the component ebpf Verifier. 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 integrity.

The weakness was released 01/22/2022. The advisory is available at bugzilla.redhat.com. This vulnerability is traded as CVE-2021-4001 since 11/22/2021. Technical details are known, but there is no available exploit.

Upgrading to version 5.16-rc2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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 5.16-rc2
Patch: git.kernel.org

Timelineinfo

11/22/2021 🔍
01/22/2022 +61 days 🔍
01/22/2022 +0 days 🔍
01/27/2022 +5 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-4001 (🔍)
GCVE (CVE): GCVE-0-2021-4001
GCVE (VulDB): GCVE-100-191406

Entryinfo

Created: 01/22/2022 07:52
Updated: 01/27/2022 09:38
Changes: 01/22/2022 07:52 (42), 01/27/2022 09:33 (1), 01/27/2022 09:38 (1)
Complete: 🔍
Cache ID: 216::103

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