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Date: Wed, 13 Jul 2022 09:27:34 +0000
From: Andrew Cooper <>
To: Salvatore Bonaccorso <>,
	"" <>
CC: "" <>,
	"" <>,
	"" <>, security team
Subject: Re: Xen Security Advisory 407 v1
 (CVE-2022-23816,CVE-2022-23825,CVE-2022-29900) - Retbleed - arbitrary
 speculative code execution with return instructions

On 12/07/2022 20:34, Salvatore Bonaccorso wrote:
> Hi,
> On Tue, Jul 12, 2022 at 09:27:07PM +0200, Salvatore Bonaccorso wrote:
>> Hi,
>> On Tue, Jul 12, 2022 at 04:36:10PM +0000, security team wrote:
>>> Hash: SHA256
>>>  Xen Security Advisory CVE-2022-23816,CVE-2022-23825,CVE-2022-29900 / XSA-407
>>>    Retbleed - arbitrary speculative code execution with return instructions
>>> =================
>>> Researchers at ETH Zurich have discovered Retbleed, allowing for
>>> arbitrary speculative execution in a victim context.
>>> For more details, see:
>>> ETH Zurich have allocated CVE-2022-29900 for AMD and CVE-2022-29901 for
>>> Intel.
>>> Despite the similar preconditions, these are very different
>>> microarchitectural behaviours between vendors.
>>> On AMD CPUs, Retbleed is one specific instance of a more general
>>> microarchitectural behaviour called Branch Type Confusion.  AMD have
>>> assigned CVE-2022-23816 (Retbleed) and CVE-2022-23825 (Branch Type
>>> Confusion).
>>> For more details, see:
>> Is it confirmed that AMD is not using CVE-2022-29900? The above
>> amd-sb-1037 references as well both CVE-2022-23825 (Branch Type
>> Confusion) and CVE-2022-29900 (RETbleed), so I assume they agreed to
>> use CVE-2022-29900 for retbleed?
>> So should the Xen advisory as well use CVE-2022-23825,CVE-2022-29900
>> and CVE-2022-29901?
> Nevermind, I missunderstood the wording and the advisory just mentions
> all the related CVEs correctly and made a thinko. It might turn out
> that CVE-2022-23816 will not be used, but then the title would read
> only as 
> Xen Security Advisory CVE-2022-23825,CVE-2022-29900 / XSA-407
> So please disregard the question above.


AMD changed the CVE in the bulletin between the final draft, and what
went public.

CVE-2022-23816 has been referenced by multiple other vendors too, so is
definitely out in the world.  Hopefully MITRE will close out one of
CVE-2022-23816 and CVE-2022-29900 as a dup of the other.

For now, I think the least confusing option is to keep both referenced.


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