OracleVM 3.2 : xen (OVMSA-2015-0143)

high Nessus Plugin ID 86802


The remote OracleVM host is missing one or more security updates.


The remote OracleVM system is missing necessary patches to address critical security updates :

- x86: rate-limit logging in do_xen[oprof,pmu]_op Some of the sub-ops are acessible to all guests, and hence should be rate-limited. In the xenoprof case, just like for XSA-146, include them only in debug builds. Since the vPMU code is rather new, allow them to be always present, but downgrade them to (rate limited) guest messages. This is XSA-152. (CVE-2015-7971)

- xenoprof: free domain's vcpu array This was overlooked in fb442e2171 ('x86_64: allow more vCPU-s per guest').
This is XSA-151. (CVE-2015-7969)

- x86: guard against undue super page PTE creation When optional super page support got added (commit bd1cd81d64 'x86: PV support for hugepages'), two adjustments were missed: mod_l2_entry needs to consider the PSE and RW bits when deciding whether to use the fast path, and the PSE bit must not be removed from L2_DISALLOW_MASK unconditionally. This is XSA-148.

[backport to Xen 4.1] (CVE-2015-7835)


Update the affected xen / xen-devel / xen-tools packages.

See Also

Plugin Details

Severity: High

ID: 86802

File Name: oraclevm_OVMSA-2015-0143.nasl

Version: 2.6

Type: local

Published: 11/9/2015

Updated: 1/4/2021

Risk Information


Risk Factor: Medium

Score: 6.5


Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:oracle:vm:xen, p-cpe:/a:oracle:vm:xen-devel, p-cpe:/a:oracle:vm:xen-tools, cpe:/o:oracle:vm_server:3.2

Required KB Items: Host/local_checks_enabled, Host/OracleVM/release, Host/OracleVM/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/6/2015

Vulnerability Publication Date: 10/30/2015

Reference Information

CVE: CVE-2015-7835, CVE-2015-7969, CVE-2015-7971