CVE-2019-18425

An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performe...

SUSE-SU-2018:2684-1 Security update for the Linux Kernel (Live Patch 24 for SLE 12 SP2)

This update for the Linux Kernel 4.4.121-9292 fixes one issue. The following security issue was fixed: - CVE-2018-10853: A KVM guest userspace to guest kernel write was fixed, which could be used by guest users to crash the guest kernel bsc1097108...

SUSE-SU-2018:2678-1 Security update for the Linux Kernel (Live Patch 2 for SLE 15)

This update for the Linux Kernel 4.12.14-256 fixes several issues. The following security issues were fixed: - CVE-2018-15471: An issue was discovered in xenvifsethashmapping in drivers/net/xen-netback/hash.c. The Linux netback driver allowed frontends to control mapping of requests to request...

Linux: Uninitialized state in x86 PV failsafe callback path

ISSUE DESCRIPTION Linux has a failsafe callback, invoked by Xen under certain conditions. Normally in this failsafe callback, errorentry is paired with errorexit; and errorentry uses %ebx to communicate to errorexit whether to use the user or kernel return path. Unfortunately, on 64-bit PV Xen on...

EulerOS 2.0 SP2 : kernel (EulerOS-SA-2018-1120)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual SDM was mishandled in the...

UBUNTU-CVE-2018-1091

In the flushtmregstothread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory TM...

Design/Logic Flaw

In the flushtmregstothread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory TM...

CVE-2018-1091

In the flushtmregstothread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory TM...

openSUSE: Security Advisory for xen (openSUSE-SU-2017:0008-1)

The remote host is missing an update for the Copyright C 2017 Greenbone Networks GmbH Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-or-later This program is free software; you can...

xen-kernel -- x86 PV guests may be able to mask interrupts

The Xen Project reports: Certain PV guest kernel operations page table writes in particular need emulation, and use Xen's general x86 instruction emulator. This allows a malicious guest kernel which asynchronously modifies its instruction stream to effect the clearing of EFLAGS.IF from the state...

x86: Mishandling of SYSCALL singlestep during emulation

ISSUE DESCRIPTION The typical behaviour of singlestepping exceptions is determined at the start of the instruction, with a DB trap being raised at the end of the instruction. SYSCALL and SYSRET, although we don't implement it behave differently because the typical behaviour allows userspace to...

x86 null segments not always treated as unusable

ISSUE DESCRIPTION The Xen x86 emulator erroneously failed to consider the unusability of segments when performing memory accesses. The intended behaviour is as follows: The user data segment %ds, %es, %fs and %gs selectors may be NULL in 32-bit to prevent access. In 64-bit, NULL has a special...

xen-kernel -- x86 null segments not always treated as unusable

The Xen Project reports: The Xen x86 emulator erroneously failed to consider the unusability of segments when performing memory accesses. The intended behaviour is as follows: The user data segment %ds, %es, %fs and %gs selectors may be NULL in 32-bit to prevent access. In 64-bit, NULL has a...

CVE-2014-3716

Xen 4.4.x does not properly check alignment, which allows local users to cause a denial of service crash via an unspecified field in a DTB header in a 32-bit guest kernel...

vulnerability in the iret hypercall handler

ISSUE DESCRIPTION A buggy loop in Xen's compatiret function iterates the wrong way around a 32-bit index. Any 32-bit PV guest kernel can trigger this vulnerability by attempting a hypercalliret with EFLAGS.VM set. Given the use of get/putuser, and that the virtual addresses in question are...

xen-kernel -- vulnerability in the iret hypercall handler

The Xen Project reports: A buggy loop in Xen's compatiret function iterates the wrong way around a 32-bit index. Any 32-bit PV guest kernel can trigger this vulnerability by attempting a hypercalliret with EFLAGS.VM set. Given the use of get/putuser, and that the virtual addresses in question are...

UBUNTU-CVE-2014-8134

The paravirtopssetup function in arch/x86/kernel/kvm.c in the Linux kernel through 3.18 uses an improper paravirtenabled setting for KVM guest kernels, which makes it easier for guest OS users to bypass the ASLR protection mechanism via a crafted application that reads a 16-bit value...

OracleVM 3.0 : xen (OVMSA-2012-0035)

The remote OracleVM system is missing necessary patches to address critical security updates : - Xen Security Advisory CVE-2012-3433 / XSA-11 HVM guest destroy p2m teardown host DoS vulnerability An HVM guest is able to manipulate its physical address space such that tearing down the guest takes ...

CVE-2014-7155

The x86emulate function in arch/x86/x86emulate/x86emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service guest crash or gain guest kernel mode privileges via vectors involving an 1 HLT, 2 LGDT, 3 LIDT, or 4...

CVE-2014-7155

The x86emulate function in arch/x86/x86emulate/x86emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service guest crash or gain guest kernel mode privileges via vectors involving an 1 HLT, 2 LGDT, 3 LIDT, or 4...