CVE-2026-90429

A flaw was found in the Linux kernel's iommu/tegra241-cmdqv component. A synchronization issue exists between the error Interrupt Service Routine (ISR) and the Virtual Interrupt Function (VINTF) de-initialization process. A concurrent error could lead to the ISR attempting to access a VINTF that is either being cleared or has already been freed, resulting in a NULL dereference or a use-after-free condition. This memory corruption vulnerability could potentially allow an attacker to cause a denial of service or escalate privileges.

A race in the Tegra241 CMDQV IOMMU driver can let the error interrupt handler observe a VINTF slot while it is being created or torn down. This can produce a NULL pointer dereference or a use-after-free when the ISR dereferences a VINTF that is NULL, partially initialized, or about to be freed. For the CVSS the PR:L is chosen because reliable triggering requires a local process with access to iommufd or delegated device assignment that can create or destroy user VINTFs. AC:H is used because the bug depends on a timing window between interrupt handling and VINTF lifecycle operations. The issue is not network reachable. Impact is at least local denial of service via kernel crash and in the paranoid case may include confidentiality and integrity impact because the patch context explicitly describes a use-after-free candidate in an interrupt path.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.