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CVE-2026-20971 is a local kernel vulnerability in Samsung KNOX affecting the PROCA driver and its interaction with the FIVE integrity subsystem prior to SMR Jan-2026 Release 1. The flaw is a use-after-free condition caused by a race during process integrity state handling, including process state transitions such as execve() and fork. In the vulnerable flow, a task_integrity object associated with a process can be freed while another kernel path still retains and dereferences a pointer to that object, creating a dangling-pointer condition in kernel memory. Reported vulnerable paths include procfs-backed integrity read operations that can continue operating on reclaimed memory after the original object has been released. Researchers reported that the bug can be triggered by an unprivileged application and can yield practical kernel memory corruption primitives. Although Samsung kernel control-flow protections reduced some exploitation paths, the vulnerability still exposed a viable route to controlled reallocation of freed memory and potential arbitrary code execution in kernel context.
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Use-after-free vulnerability in Samsung KNOX components PROCA and FIVE that allowed a local unprivileged application to corrupt kernel memory and potentially escalate privileges on affected Samsung Galaxy devices.
A critical use-after-free kernel vulnerability in Samsung KNOX PROCA/FIVE subsystems caused by a race condition in process integrity validation, potentially enabling kernel memory corruption and full device takeover from an untrusted application.
A use-after-free vulnerability in the Samsung Android kernel affecting Galaxy S9 through S25 devices.
A use-after-free race condition in Samsung KNOX kernel components PROCA/FIVE that can be triggered from an untrusted app, leading to kernel memory corruption and potentially complete device takeover.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.