Linux Kernel up to 5.15.6 wait_fence 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 marked as critical has been reported in Linux Kernel up to 5.15.6. Affected by this issue is the function wait_fence. This manipulation causes memory leak. The identification of this vulnerability is CVE-2021-47530. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.15.6 and classified as critical. Affected by this vulnerability is the function wait_fence. The manipulation with an unknown input leads to a memory leak vulnerability. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix wait_fence submitqueue leak We weren't dropping the submitqueue reference in all paths. In particular, when the fence has already been signalled. Split out a helper to simplify handling this in the various different return paths.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2021-47530. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.15.7 eliminates this vulnerability. Applying the patch 4c3cdbf25403/ea0006d390a2 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.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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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

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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 5.15.7
Patch: 4c3cdbf25403/ea0006d390a2

Timelineinfo

05/24/2024 🔍
05/24/2024 +0 days 🔍
09/29/2025 +493 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-47530 (🔍)
GCVE (CVE): GCVE-0-2021-47530
GCVE (VulDB): GCVE-100-266179

Entryinfo

Created: 05/24/2024 17:39
Updated: 09/29/2025 19:13
Changes: 05/24/2024 17:39 (56), 09/29/2025 19:13 (12)
Complete: 🔍
Cache ID: 216::103

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