CVE-2022-50482: iommu/vt-d: Clean up si_domain in the init_dmars() error path

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: 2025-10-04 · updated 2026-06-17
Weakness: CWE-908

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Clean up si_domain in the init_dmars() error path A splat from kmem_cache_destroy() was seen with a kernel prior to commit ee2653bbe89d ("iommu/vt-d: Remove domain and devinfo mempool") when there was a failure in init_dmars(), because the iommu_domain cache still had objects. While the mempool code is now gone, there still is a leak of the si_domain memory if init_dmars() fails. So clean up si_domain in the init_dmars() error path.

Affected products

Linux kernel: from 4.2 before 4.14.298; from 4.15 before 4.19.264; from 4.20 before 5.4.221; from 5.5 before 5.10.152; from 5.11 before 5.15.76; from 5.16 before 6.0.6 — fixed in 4.14.298, 4.19.264, 5.10.152, 5.15.76, 5.4.221, 6.0.6

How to fix

Upgrade to a fixed version: Linux kernel 4.14.298, 4.19.264, 5.10.152, 5.15.76. Check the vendor advisory for mitigations.

References

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