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Newer Intel microarchitectures as well as AMD starting with Zen 3 are not affected. The mitigations for the vulnerability decrease the performance of the affected Intel CPUs by up to 39%, while AMD CPUs lose up to 14%. In August 2022, the SQUIP vulnerability was disclosed affecting Ryzen 2000–5000 series CPUs. [52]
Intel promised microcode updates to resolve the vulnerability. [1] The microcode patches have been shown to significantly reduce the performance of some heavily-vectorized loads. [7] Patches to mitigate the effects of the vulnerability have also been created as part of the forthcoming version 6.5 release of the Linux kernel. [8]
Meltdown exploits a race condition, inherent in the design of many modern CPUs.This occurs between memory access and privilege checking during instruction processing. . Additionally, combined with a cache side-channel attack, this vulnerability allows a process to bypass the normal privilege checks that isolate the exploit process from accessing data belonging to the operating system and other ...
The vulnerability is known to affect Skylake and later processors from Intel and Zen-based processors from AMD. [ 54 ] In February 2023, a team of researchers at North Carolina State University uncovered a new code execution vulnerability called Spectre-HD, also known as "Spectre SRV" or "Spectre v6".
According to varying reports, Intel processors dating back to 2011 [12] or 2008 [1] are affected, and the fixes may be associated with a performance drop. [ 13 ] [ 14 ] Intel reported that processors manufactured in the month before the disclosure have mitigations against the attacks.
According to the researchers, Retbleed mitigations require extensive changes to the system which results in up to 14% and 39% performance loss on Linux for affected AMD and Intel CPU respectively. [4] The PoC works against Intel Core 6th, 7th and 8th generation microarchitectures and AMD Zen 1, Zen 1+, and Zen 2 microarchitectures.
In theory, any processor affected by Meltdown may be vulnerable to LVI, [4] but as of March 2020, LVI is only known to affect Intel microprocessors. [2] Intel has published a guide to mitigating the vulnerability by using compiler technology, requiring existing software to be recompiled to add LFENCE memory barrier instructions at every ...
66 MHz Intel Pentium (sSpec=SX837) with the FDIV bug. The Pentium FDIV bug is a hardware bug affecting the floating-point unit (FPU) of the early Intel Pentium processors. Because of the bug, the processor would return incorrect binary floating point results when dividing certain pairs of high-precision numbers.