Linux · Linux Kernel · CVE-2026-53281
**Name of the Vulnerable Software and Affected Versions**
Linux kernel (affected versions not specified)
**Description**
A NULL pointer dereference or refcount corruption exists in the iommu/vt-d component. When `dev pasid` is not found in the `dev pasids` list and remains NULL, teardown operations are executed unconditionally. If the domain was never attached to the IOMMU, the `info` variable will be NULL, leading to an immediate dereference when checking `info->refcnt`. Additionally, decrementing the refcount without removing a valid PASID can unbalance the count, potentially causing the refcount to drop to 0 prematurely and resulting in a use-after-free for other active devices sharing the domain.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.