What is CVE-2021-47327?

CVE-2021-47327 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10. CVE-2021-47327 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47327?

CVE-2021-47327 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2021-47327?

No patch is currently available for CVE-2021-47327. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-47327 actively exploited?

CVE-2021-47327 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47327

High

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0. The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak. Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-04-02

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness type

CWE-911

CVE-2021-47327 is classified as CWE-911

See CWE-911 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-47327 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f
Patch
Kernel patch commit
https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2021-47327

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-04-02

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-47327?

CVE-2021-47327 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . CVE-2021-47327 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47327?

CVE-2021-47327 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2021-47327?

No patch is currently available for CVE-2021-47327. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-47327 actively exploited?

No — CVE-2021-47327 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.