What’s Vulnerable › Vulnerabilities
CVE-2021-47325: iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-05-21 · updated 2026-06-17
Description
In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation The reference counting issue happens in several exception handling paths of arm_smmu_iova_to_phys_hard(). When those error scenarios occur, the function forgets to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak. Fix this issue by jumping to "out" label when those error scenarios occur.
Affected products
- Linux kernel: before 5.4.134; from 5.5 before 5.10.52; from 5.11 before 5.12.19; from 5.13 before 5.13.4 — fixed in 5.10.52, 5.12.19, 5.13.4, 5.4.134
How to fix
Upgrade to a fixed version: Linux kernel 5.10.52, 5.12.19, 5.13.4, 5.4.134. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/0f0c5ea09139777d90729d408b807021f2ea6492
- https://git.kernel.org/stable/c/43d1aaa1965f9b58035196dac49b1e1e6c9c25eb
- https://git.kernel.org/stable/c/5f9741a9a91f25c89e04b408cd61e3ab050ce24b
- https://git.kernel.org/stable/c/7c8f176d6a3fa18aa0f8875da6f7c672ed2a8554
- https://git.kernel.org/stable/c/b11220803ad14a2a880cc06d8e01fe2548cc85b0
- https://git.kernel.org/stable/c/0f0c5ea09139777d90729d408b807021f2ea6492
- https://git.kernel.org/stable/c/43d1aaa1965f9b58035196dac49b1e1e6c9c25eb
- https://git.kernel.org/stable/c/5f9741a9a91f25c89e04b408cd61e3ab050ce24b
- https://git.kernel.org/stable/c/7c8f176d6a3fa18aa0f8875da6f7c672ed2a8554
- https://git.kernel.org/stable/c/b11220803ad14a2a880cc06d8e01fe2548cc85b0
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