Spectre vulnerability 202212/12/2023 These entries may correspond to registers previously used by the same thread, or by the sibling thread on the same processor core.” In some situations when a gather instruction performs certain loads from memory, it may be possible for a malicious attacker to use this type of instruction to infer stale data from previously used vector registers. “Gather Data Sampling (GDS) is a transient execution side channel vulnerability affecting certain Intel processors. “Microsoft is aware of a new transient execution attack named gather data sampling (GDS) or “Downfall.” This vulnerability could be used to infer data from affected CPUs across security boundaries such as user-kernel, processes, virtual machines (VMs), and trusted execution environments.” The new GDS flaw, dubbed “Downfall”, is tracked under CVE-2022-40982… ![]() Intel and Microsoft have confirmed that almost all of Intel’s desktop processors, prior to 12th Gen CPUs, are vulnerable to a new Transient Execution or Speculative execution side-channel attack called Gather Data Sampling (GDS) vulnerability (codenamed “Downfall”). Microsoft, Intel confirm “Downfall” of 7th, 8th, 9th, 10th, 11th Gen CPUs, firmware out Hence, AMD believes this vulnerability is only potentially exploitable locally, such as via downloaded malware, and recommends customers employ security best practices, including running up-to-date software and malware detection tools.ĪMD is not aware of any exploit of ‘Inception’ outside the research environment at this time… As with similar attacks, speculation is constrained within the current address space and to exploit, an attacker must have knowledge of the address space and control of sufficient registers at the time of RET (return from procedure) speculation. This attack is similar to previous branch prediction-based attacks like Spectrev2 and Branch Type Confusion (BTC)/RetBleed. The attack can result in speculative execution at an attacker-controlled address, potentially leading to information disclosure. Hopefully some clever coders will come up with a way to mitigate that performance loss.AMD has received an external report titled ‘INCEPTION’, describing a new speculative side channel attack. When they do become available, they may come with a performance hit of as much as 28%. Both AMD and Intel say that they're not aware of anyone making use of these vulnerabilities in the wild, but patches aren't available yet. Linux users on affected machines do have cause for concern, though, and that particularly extends to hosting providers and other folks that allow remote users to login to their systems without supervision. IBRS is an effective mitigation against retbleed, so Windows systems are essentially inoculated already. ![]() Intel says that it's also automatically mitigated by recent versions of Windows, which have Indirect Branch Restricted Speculation (IBRS) enabled by default. ![]() While retbleed is a very serious vulnerability, it only affects certain hardware: Intel machines from the 6th thru 8th generation Core families, and AMD Zen, Zen+, and Zen 2 systems. Everyone reading this should flip out and rush to patch their systems, right? No, probably not.
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