Qemu Memory Misreference Vulnerability

QEMU is an open source emulator software. A memory misreference vulnerability exists when Qemu, which supports IDE Emulation PCI PIIX3/4, writes data to a client I/O port, which can be exploited by a client user to cause a Qemu instance to crash, resulting in a denial of service...

Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2015-3054)

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-3054 advisory. - KVM: x86: SYSENTER emulation is broken Nadav Amit Orabug: 21502740 CVE-2015-0239 CVE-2015-0239 - x86/tls: Validate TLS entries to protect espfix...

Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2015-3055)

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-3055 advisory. - KVM: x86: SYSENTER emulation is broken Nadav Amit Orabug: 21502741 CVE-2015-0239 CVE-2015-0239 - x86/tls: Validate TLS entries to protect espfix...

[USN-2692-1] QEMU vulnerabilities

========================================================================== Ubuntu Security Notice USN-2692-1 July 28, 2015 qemu vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubunt...

OracleVM 3.3 : kernel-uek (OVMSA-2015-0104)

The remote OracleVM system is missing necessary patches to address critical security updates : - KVM: x86: SYSENTER emulation is broken Nadav Amit Orabug: 21502739 CVE-2015-0239 CVE-2015-0239 - fs: take imutex during preparebinprm for setugid executables Jann Horn Orabug: 21502254 CVE-2015-3339 -...

Unbreakable Enterprise kernel security update

2.6.39-400.250.9 - x86, tls: Interpret an all-zero struct userdesc as 'no segment' Andy Lutomirski Orabug: 21514969 - x86, tls, ldt: Stop checking lm in LDTempty Andy Lutomirski Orabug: 21514969 2.6.39-400.250.8 - KVM: x86: SYSENTER emulation is broken Nadav Amit Orabug: 21502740 CVE-2015-0239...

Scientific Linux Security Update : qemu-kvm on SL7.x x86_64 (20150727)

A heap buffer overflow flaw was found in the way QEMU's IDE subsystem handled I/O buffer access while processing certain ATAPI commands. A privileged guest user in a guest with the CDROM drive enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the...

USN-2692-1: QEMU vulnerabilities

Matt Tait discovered that QEMU incorrectly handled PIT emulation. In a non-default configuration, a malicious guest could use this issue to cause a denial of service, or possibly execute arbitrary code on the host as the user running the QEMU process. In the default installation, when QEMU is use...

qemu/kvm: i8254: out-of-bounds memory access in pit_ioport_read function

An out-of-bounds memory access flaw, leading to memory corruption or possibly an information leak, was found in QEMU's pitioportread function. A privileged guest user in a QEMU guest, which had QEMU PIT emulation enabled, could potentially, in rare cases, use this flaw to execute arbitrary code o...

qemu/kvm: i8254: out-of-bounds memory access in pit_ioport_read function

An out-of-bounds memory access flaw, leading to memory corruption or possibly an information leak, was found in QEMU's pitioportread function. A privileged guest user in a QEMU guest, which had QEMU PIT emulation enabled, could potentially, in rare cases, use this flaw to execute arbitrary code o...

CVE-2015-5158

Stack-based buffer overflow in hw/scsi/scsi-bus.c in QEMU, when built with SCSI-device emulation support, allows guest OS users with CAPSYSRAWIO permissions to cause a denial of service instance crash via an invalid opcode in a SCSI command descriptor block...

kernel: kvm: insufficient sysenter emulation when invoked from 16-bit code

It was found that the Linux kernel KVM subsystem's sysenter instruction emulation was not sufficient. An unprivileged guest user could use this flaw to escalate their privileges by tricking the hypervisor to emulate a SYSENTER instruction in 16-bit mode, if the guest OS did not initialize the...

kernel: int80 fork from 64-bit tasks mishandling

A flaw was found in the way the Linux kernel's 32-bit emulation implementation handled forking or closing of a task with an 'int80' entry. A local user could potentially use this flaw to escalate their privileges on the system...

FreeBSD : xen-kernel -- arm: vgic-v2: GICD_SGIR is not properly emulated (785c86b1-27d6-11e5-a4a5-002590263bf5)

The Xen Project reports : When decoding a guest write to a specific register in the virtual interrupt controller Xen would treat an invalid value as a critical error and crash the host. By writing an invalid value to the GICD.SGIR register a guest can crash the host, resulting in a Denial of...

FreeBSD : xen-kernel -- Information leak via internal x86 system device emulation (5023f559-27e2-11e5-a4a5-002590263bf5)

The Xen Project reports : Emulation routines in the hypervisor dealing with certain system devices check whether the access size by the guest is a supported one. When the access size is unsupported these routines failed to set the data to be returned to the guest for read accesses, so that...

QEMU Code Execution

The vulnerability of the QEMU hardware emulation software arises from an overflow in the buffer of dynamic memory. Exploiting this vulnerability allows a remote attacker to execute arbitrary code by sending specially crafted packets containing the TXSTATUSSTARTPACKET and TXSTATUSDEVICEOWNS fields...

qemu: pcnet: multi-tmd buffer overflow in the tx path

A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled multi-TMD packets with a length above 4096 bytes. A privileged guest user in a guest with an AMD PCNet ethernet card enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the...

kernel, perf, python security update

CentOS Errata and Security Advisory CESA-2015:1137 Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System...

kernel: int80 fork from 64-bit tasks mishandling

A flaw was found in the way the Linux kernel's 32-bit emulation implementation handled forking or closing of a task with an 'int80' entry. A local user could potentially use this flaw to escalate their privileges on the system...

[SECURITY] Fedora 21 Update: qemu-2.1.3-8.fc21

QEMU is a generic and open source processor emulator which achieves a good emulation speed by using dynamic translation. QEMU has two operating modes: Full system emulation. In this mode, QEMU emulates a full system for example a PC, including a processor and various peripherials. It can be used ...