The most recent Spectre-class flaw targets a component in CPUs called the return stack buffer.

The new hardware-based protections Intel announced earlier in March it was embedding into new chips will only protect against Spectre and Meltdown – but not the newly disclosed Variant 4, sources said.

Yet another speculative execution side channel flaw has been disclosed in processors – and security experts warn that more may be out there.

Intel on Monday acknowledged that its processors are vulnerable to another Spectre-like speculative execution side channel flaw that could allow attackers to access information.