# CVE-2017-15597: libxen-4.9: An issue was discovered in Xen through 4.9.x

CVE-2017-15597 is fixed in 20 products on 1 platform, first by libxen-4.9 4.9.2-0ubuntu1, released December 12, 2017. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-15597
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0283
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 30, 2017

## Description

An issue was discovered in Xen through 4.9.x. Grant copying code made an implication that any grant pin would be accompanied by a suitable page reference. Other portions of code, however, did not match up with that assumption. When such a grant copy operation is being done on a grant of a dying domain, the assumption turns out wrong. A malicious guest administrator can cause hypervisor memory corruption, most likely resulting in host crash and a Denial of Service. Privilege escalation and information leaks cannot be ruled out.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libxen-4.9 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [libxen-4.9 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxen-4.9-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | libxenstore3.0 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [libxenstore3.0 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxenstore3.0-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.6-amd64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.6-amd64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.6-amd64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.6-arm64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.6-arm64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.6-arm64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.6-armhf Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.6-armhf 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.6-armhf-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.7-amd64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.7-amd64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.7-amd64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.7-arm64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.7-arm64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.7-arm64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.7-armhf Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.7-armhf 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.7-armhf-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.8-amd64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.8-amd64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.8-amd64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.8-arm64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.8-arm64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.8-arm64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.8-armhf Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.8-armhf 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.8-armhf-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.9-amd64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.9-amd64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.9-amd64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.9-arm64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.9-arm64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.9-arm64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-hypervisor-4.9-armhf Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-hypervisor-4.9-armhf 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-hypervisor-4.9-armhf-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-system-amd64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-system-amd64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-system-amd64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-system-arm64 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-system-arm64 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-system-arm64-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-system-armhf Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-system-armhf 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-system-armhf-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-utils-4.9 Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-utils-4.9 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-utils-4.9-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xen-utils-common Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xen-utils-common 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xen-utils-common-4.9.2-0ubuntu1.md) | Dec 12, 2017 |
| Linux | xenstore-utils Ubuntu 18.04.6 LTS (bionic) | 4.9.2-0ubuntu1 | [xenstore-utils 4.9.2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xenstore-utils-4.9.2-0ubuntu1.md) | Dec 12, 2017 |

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