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Wed, 18 Jun 2025 07:21:33 -0400 (EDT) Date: Wed, 18 Jun 2025 13:21:31 +0200 From: Greg KH To: Juergen Gross Cc: cve@kernel.org, linux-kernel@vger.kernel.org Subject: Re: CVE-2025-38046: xen: Add support for XenServer 6.1 platform device Message-ID: <2025061823-powdery-gauze-b705@gregkh> References: <2025061830-CVE-2025-38046-3356@gregkh> <42f8eb9a-2807-4a7f-9e24-35e87a35c6f3@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <42f8eb9a-2807-4a7f-9e24-35e87a35c6f3@suse.com> On Wed, Jun 18, 2025 at 11:55:24AM +0200, Juergen Gross wrote: > On 18.06.25 11:33, Greg Kroah-Hartman wrote: > > From: Greg Kroah-Hartman > > > > Description > > =========== > > > > In the Linux kernel, the following vulnerability has been resolved: > > > > xen: Add support for XenServer 6.1 platform device > > > > On XenServer on Windows machine a platform device with ID 2 instead of > > 1 is used. > > > > This device is mainly identical to device 1 but due to some Windows > > update behaviour it was decided to use a device with a different ID. > > > > This causes compatibility issues with Linux which expects, if Xen > > is detected, to find a Xen platform device (5853:0001) otherwise code > > will crash due to some missing initialization (specifically grant > > tables). Specifically from dmesg > > > > RIP: 0010:gnttab_expand+0x29/0x210 > > Code: 90 0f 1f 44 00 00 55 31 d2 48 89 e5 41 57 41 56 41 55 41 89 fd > > 41 54 53 48 83 ec 10 48 8b 05 7e 9a 49 02 44 8b 35 a7 9a 49 02 > > <8b> 48 04 8d 44 39 ff f7 f1 45 8d 24 06 89 c3 e8 43 fe ff ff > > 44 39 > > RSP: 0000:ffffba34c01fbc88 EFLAGS: 00010086 > > ... > > > > The device 2 is presented by Xapi adding device specification to > > Qemu command line. > > > > The Linux kernel CVE team has assigned CVE-2025-38046 to this issue. > > Please revoke this CVE, as this issue can't be triggered by an > unprivileged user. Now rejected, thanks for the review. greg k-h