SUSE SLES12 Security Update : xen (SUSE-SU-2019:0827-1)

This update for xen fixes the following issues : Security issues fixed : CVE-2019-6778: Fixed a heap buffer overflow in tcpemu found in slirp bsc1123157. CVE-2017-13672: Fixed an out of bounds read access during display update bsc1056336. Fixed an issue which could allow malicious or buggy guests...

SUSE-SU-2019:0825-1 Security update for xen

This update for xen fixes the following issues: Security issues fixed: - CVE-2018-18849: Fixed an out of bounds memory access issue that was found in the LSI53C895A SCSI Host Bus Adapter emulation while writing a message in lsidomsgin. It could occur during migration if the 'msglen' field has an...

openSUSE Security Update : xen (openSUSE-2019-1046) (Foreshadow)

This update for xen fixes the following issues : Update to Xen 4.10.2 bug fix release bsc1027519. Security vulnerabilities fixed : - CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, m...

openSUSE Security Update : the Linux Kernel (openSUSE-2019-974)

The openSUSE Leap 15.0 kernel was updated to 4.12.14-lp150.12.28.1 to receive various security and bugfixes. The following security bugs were fixed : - CVE-2018-18281: The mremap syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate removes entries from the...

EulerOS 2.0 SP3 : kernel (EulerOS-SA-2019-1108)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A flaw was discovered in the Linux kernel's USB subsystem in the usbgetextradescriptor function in the drivers/usb/core/usb.c which mishandles a...

Fedora 28 : xen (2019-bce6498890)

xen: various flaws 1685577 grant table transfer issues on large hosts XSA-284 race with pass-through device hotplug XSA-285 x86: stealpage violates pagestruct access discipline XSA-287 x86: Inconsistent PV IOMMU discipline XSA-288 missing preemption in x86 PV page table unvalidation XSA-290 x86/P...

Xen Project Process Context Identifiers TLB Flushing Multiple Vulnerabilities (XSA-292)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by multiple vulnerabilities including denial of service, information disclosure, and privilege escalation. Only x86 systems are affected. Note that Nessus has checked the changeset versions...

Fedora 29 : xen (2019-3e89502cb1)

xen: various flaws 1685577 grant table transfer issues on large hosts XSA-284 race with pass-through device hotplug XSA-285 x86: stealpage violates pagestruct access discipline XSA-287 x86: Inconsistent PV IOMMU discipline XSA-288 missing preemption in x86 PV page table unvalidation XSA-290 x86/P...

x86 shadow: Insufficient TLB flushing when using PCID

ISSUE DESCRIPTION Use of Process Context Identifiers PCID was introduced into Xen in order to improve performance after XSA-254 and in particular its Meltdown sub-issue. This enablement implied changes to the TLB flushing logic. One aspect which was overlooked is the safety of switching between...

x86: insufficient TLB flushing when using PCID

ISSUE DESCRIPTION Use of Process Context Identifiers PCID was introduced into Xen in order to improve performance after XSA-254 and in particular its Meltdown sub-issue. This enablement implied changes to the TLB flushing logic. The particular case of context switch to a vCPU of a PCID-enabled...

Ubuntu 18.04 LTS : Linux kernel (AWS, GCP, KVM, OEM, Raspberry Pi 2) vulnerabilities (USN-3871-3)

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3871-3 advisory. Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to...

Ubuntu 16.04 LTS : Linux kernel (HWE) vulnerabilities (USN-3871-4)

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3871-4 advisory. USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enableme...

Ubuntu 18.04 LTS : Linux kernel regression (USN-3871-2)

The remote Ubuntu 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-3871-2 advisory. USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. Unfortunately, that update introduced regressions with docking station displays and...

Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3880-1)

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3880-1 advisory. It was discovered that the CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a...

USN-3871-3: Linux kernel (AWS, GCP, KVM, OEM, Raspberry Pi 2) vulnerabilities

Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service system crash or possibly execute arbitrary code...

SUSE SLES12 Security Update : kernel (SUSE-SU-2019:0222-1) (Spectre)

The SUSE Linux Enterprise 12 SP4 kernel for Azure was updated to receive various security and bugfixes. The following security bugs were fixed : CVE-2018-19407: The vcpuscanioapic function in arch/x86/kvm/x86.c allowed local users to cause a denial of service NULL pointer dereference and BUG via...

USN-3871-2: Linux kernel regression

USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. Unfortunately, that update introduced regressions with docking station displays and mounting ext4 file systems with the metabg option enabled. This update fixes the problems. We apologize for the inconvenience. Original...

USN-3871-1: Linux kernel vulnerabilities

Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service system crash or possibly execute arbitrary code...

Taking a page from the kernel's book: A TLB issue in mremap()

Posted by Jann Horn, Project Zero This is a technical blog post about TLB flushing bugs in kernels, intended for people interested in kernel security and memory management. Introduction: Bugs in Memory Management code There have been some pretty scary bugs in memory management in the past, like:...

Debian DSA-4369-1 : xen - security update

Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-19961 / CVE-2018-19962 Paul Durrant discovered that incorrect TLB handling could result in denial of service, privilege escalation or information leaks. - CVE-2018-19965 Matthew Daley discovered that incorrect handli...