CVE-2021-47327
Linux Kernel ARM SMMU Reference Counting Leak
Description
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 2, 2025, 2:33 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.2
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2021-47327.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2021-47327 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47327 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.52 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.13.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.134 Added Reference Type CVE: https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d Added Reference https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f Added Reference https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 Added Reference https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 Added Reference https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 03, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-911 Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47327 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47327
weaknesses.