01 Record

CVE-2021-47327

iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails

HighPUBLISHEDCNA: Linux

CNA base score7.1 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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02 Description

iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 17.1% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-05-21 14:35Z2 YR AGO

Last updated

2026-05-11 13:52Z3 MO AGO

Reserved

2024-05-21

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

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

Weaknesses

CWE-911Improper Update of Reference CountBase

Data version

5.2

Document digest

43a1dd8f7333430d996d7f4edf522ff159910b4590190580658345c70d5a8e2e

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 to < 3761ae0d0e549f2acdaf11f49df4ed06d256b20f, d4a44f0750bb9bf7c44c22444a482756b2344a79 to < c4007596fbdabc29f858dc2e1990858a146b60b2, d4a44f0750bb9bf7c44c22444a482756b2344a79 to < fbf4daa6f4105e01fbd3868006f65c163365c1e3, d4a44f0750bb9bf7c44c22444a482756b2344a79 to < fe92c058199067ae90cf2a901ddf3c271893557a, d4a44f0750bb9bf7c44c22444a482756b2344a79 to < 1adf30f198c26539a62d761e45af72cde570413d, 5.0—

linuxlinux_kernel1da177e4c3f4 to < 3761ae0d0e54, 1da177e4c3f4 to < c4007596fbda, 1da177e4c3f4 to < fbf4daa6f410, 1da177e4c3f4 to < fe92c0581990, 1da177e4c3f4 to < 1adf30f198c2—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f
git.kernel.orghttps://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2
git.kernel.orghttps://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3
git.kernel.orghttps://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a
git.kernel.orghttps://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d

01 Record index

CVE-2021-47327

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47327

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References