CVE-2021-44733 evidence review

linux kernel, enterprise linux

A use-after-free exists in drivers/tee/tee_shm.c in the TEE subsystem in the Linux kernel through 5.15.11. This occurs because of a race condition in tee_shm_get_from_id during an attempt to free a shared memory object.

Open CVE record

Evidence review

This record remains available for product and version identification, but it is not presented as a complete remediation procedure. Confirm the affected range and the supported fix in a direct vendor advisory before changing production systems.

Productlinux kernel, enterprise linux

Affected versions>= 4.12 < 4.14.261, >= 4.15 < 4.19.224, >= 4.20 < 5.4.170, >= 5.5 < 5.10.89, >= 5.11 < 5.15.12, 8.0, 35, 9.0, 10.0, 11.0

Fixed versions4.14.261, 4.19.224, 5.4.170, 5.10.89, 5.15.12

Priority basisReview · CVSS 7 · EPSS 0.70%

Identify the product and installed version

Record whether linux kernel, enterprise linux is present, where it is installed, and which interfaces are exposed.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Compare the affected range

Use the current record as an identification aid: >= 4.12 < 4.14.261, >= 4.15 < 4.19.224, >= 4.20 < 5.4.170, >= 5.5 < 5.10.89, >= 5.11 < 5.15.12, 8.0, 35, 9.0, 10.0, 11.0. Resolve incomplete inventory results before deciding that an asset is unaffected.

Verify the authoritative remediation source

Open the linked source material and locate a direct vendor advisory for this CVE. Confirm the supported fixed release and product-specific update path before making a production change.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.