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Date: Thu, 7 Apr 2022 17:16:26 +0800
From: Qiuhao Li <>
To: Solar Designer <>, kangel <>
 Pedro Sampaio <>,
Subject: Re: Linux kernel: x86/kvm: null-ptr-deref in

On 4/7/22 16:35, Solar Designer wrote:
> Further in the linux-distros thread, this got assigned CVE-2022-1263,
> however is this really a security issue - in other words, is a security
> boundary crossed in triggering the bug?  I think it is not, and if so
> the CVE ID should probably be rejected.  From the PoC:
>> 		res = syscall(__NR_openat, 0xffffffffffffff9cul, "/dev/kvm", 0ul, 0ul);

We sent the report to oss-security as instructed by linux-distro.

As Paolo said, /dev/kvm can be accessed by an unprivileged local user. 
So it's a Dos. It also seems like there is a kernel NPD issue on oss 

> In fact, also in the linux-distros thread it was promptly agreed that
> this doesn't need an embargo - perhaps precisely because of no security
> relevance?  If so, that should have been said explicitly, so a CVE ID
> wouldn't be assigned (it was by another person).

We are willing to cooperate with the final decision of the CVE issuer 
and oss-security.

Personally, I agree with Paolo this is not a scary bug. No embargo makes 
it be fixed quickly.

   Qiuhao Li

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