Re: CVE-2024-26908: x86/xen: Add some null pointer checking to smp.c

Re: CVE-2024-26908: x86/xen: Add some null pointer checking to smp.c

[Juergen Gross]

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Hi,

I'd like to dispute CVE-2024-26908: the issue fixed by upstream commit
3693bb4465e6e32a204a5b86d3ec7e6b9f7e67c2 can in no way be triggered by
an unprivileged user or by a remote attack of the system, as it requires
hotplug of (virtual) cpus to the running system. This can be done only by
either a host admin or by an admin of the guest which might suffer the
out-of-memory situation.

Please revoke this CVE.


Juergen

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Re: CVE-2024-26908: x86/xen: Add some null pointer checking to smp.c

[Greg KH]

On Mon, Apr 29, 2024 at 01:53:44PM +0200, Juergen Gross wrote:
> Hi,
> 
> I'd like to dispute CVE-2024-26908: the issue fixed by upstream commit
> 3693bb4465e6e32a204a5b86d3ec7e6b9f7e67c2 can in no way be triggered by
> an unprivileged user or by a remote attack of the system, as it requires
> hotplug of (virtual) cpus to the running system. This can be done only by
> either a host admin or by an admin of the guest which might suffer the
> out-of-memory situation.
> 
> Please revoke this CVE.

Sorry for the delay, thanks for looking into this and letting us know.
It's now rejected.

greg k-h

Re: CVE-2021-47377: kernel: xen/balloon: use a kernel thread instead a workqueue

[Juergen Gross]

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Hi,

I'd like to dispute CVE-2021-47377: the issue fixed by upstream commit
8480ed9c2bbd56fc86524998e5f2e3e22f5038f6 can in no way be triggered by
an unprivileged user or by a remote attack of the system, as it requires
initiation of memory ballooning of the running system. This can be done
only by either a host admin or by an admin of the guest which might
suffer the detection of the hanging workqueue.

Please revoke this CVE.


Juergen

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Re: CVE-2021-47377: kernel: xen/balloon: use a kernel thread instead a workqueue

[Greg KH]

On Mon, May 27, 2024 at 12:58:16PM +0200, Juergen Gross wrote:
> Hi,
> 
> I'd like to dispute CVE-2021-47377: the issue fixed by upstream commit
> 8480ed9c2bbd56fc86524998e5f2e3e22f5038f6 can in no way be triggered by
> an unprivileged user or by a remote attack of the system, as it requires
> initiation of memory ballooning of the running system. This can be done
> only by either a host admin or by an admin of the guest which might
> suffer the detection of the hanging workqueue.
> 
> Please revoke this CVE.

Ah, good catch, this came in as part of the GSD import, and I missed
that this required that type of permissions.  Now revoked, thanks for
the review!

greg k-h