Linux Kernel up to 5.14.11 amdkfd kfd_mem_dmamap_userptr memory leak

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.14.11. It has been classified as critical. This affects the function kfd_mem_dmamap_userptr of the component amdkfd. The manipulation leads to memory leak. This vulnerability is uniquely identified as CVE-2021-47420. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.14.11 and classified as critical. This issue affects the function kfd_mem_dmamap_userptr of the component amdkfd. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix a potential ttm->sg memory leak Memory is allocated for ttm->sg by kmalloc in kfd_mem_dmamap_userptr, but isn't freed by kfree in kfd_mem_dmaunmap_userptr. Free it!

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2021-47420 since 05/21/2024. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.14.12 eliminates this vulnerability. Applying the patch 7e5ce6029b62/b072ef1215ac 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.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2024-1197). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • IBM InfoSphere Guardium
  • Oracle Linux
  • EMC Avamar
  • Dell NetWorker
  • IBM Security Guardium
  • RESF Rocky Linux
  • Broadcom Brocade SANnav
  • Open Source Linux Kernel
  • IBM Business Automation Workflow
  • IBM Spectrum Protect Plus
  • IBM QRadar SIEM
  • Dell Avamar
  • Juniper Junos Space
  • IBM DB2
  • IBM Storage Scale System
  • SolarWinds Security Event Manager
  • Dell PowerProtect Data Domain
  • Dell PowerProtect Data Domain Management Center
  • Dell PowerProtect Data Domain OS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

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 5.14.12
Patch: 7e5ce6029b62/b072ef1215ac

Timelineinfo

05/21/2024 🔍
05/21/2024 +0 days 🔍
05/21/2024 +0 days 🔍
08/22/2025 +457 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-47420 (🔍)
GCVE (CVE): GCVE-0-2021-47420
GCVE (VulDB): GCVE-100-265487
CERT Bund: WID-SEC-2024-1197 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service und unspezifische Angriffe

Entryinfo

Created: 05/21/2024 18:08
Updated: 08/22/2025 00:22
Changes: 05/21/2024 18:08 (58), 12/30/2024 20:45 (12), 08/22/2025 00:22 (7)
Complete: 🔍
Cache ID: 216::103

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

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