Linux Kernel Updated To Add Zenbleed Fix For Valve's Steam Deck
Linux Kernel Updated To Add Zenbleed Fix For Valve's Steam Deck
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Linux Kernel Updated To Add Zenbleed Fix For Valve's Steam Deck
7 comments
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If there is a performance cost for this, hopefully it isn't too high given the limited resources of the Deck.
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The headroom required for the mitigation is statistically insignificant according to the details page on the cve.
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Good to see. That seems to have been the case with most of the AMD vulnerabilities actually. Which stands in stark contrast to the "up to 50%" hit of Intel's Downfall, and some of the other Intel vulnerabilities.
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What is Zenbleed?
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It's a vulnerability that affects AMD CPUs that can potentially lead to unintentional/malicious data leak.
https://security.googleblog.com/2023/08/downfall-and-zenbleed-googlers-helping.html?m=1
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7 comments
This is the best summary I could come up with:
Last month when the Linux kernel was mitigated for Zenbleed as a CPU vulnerability affecting AMD Zen 2 processors, it turns out the Steam Deck APU was accidentally left without coverage.
An x86/urgent pull request sent out today for the Linux 6.5 kernel and for back-porting to current stable Linux kernel releases will extend the Zenbleed mitigation to protect Steam Deck gamers.
Most notable with these fixes is adding models 0x90-0x91 to the range of AMD Zenbleed-affected Zen 2 processors.
It looks like the Steam Deck's custom APU was just accidentally left out in the original Zenbleed patch.
This patch enables the Zenbleed fallback fix until a proper CPU microcode update is available for the Steam Deck.
Zenbleed (CVE-2023-20593) was disclosed last month after this data leakage vulnerability was discovered by a Google researcher.
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