USN-4751-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities

It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information kernel memory. CVE-2020-25656 Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling...

DEBIAN-CVE-2021-27379

An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service host OS crash or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct...

DEBIAN-CVE-2021-26933

An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes such as the ones during scrubbing have reached the memory before handing over the page to a guest...

UBUNTU-CVE-2021-26930

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later...

DEBIAN-CVE-2020-29570

An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels c...

DEBIAN-CVE-2020-29566

An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device...

DEBIAN-CVE-2020-27671

An issue was discovered in Xen through 4.14.x allowing x86 HVM and PVH guest OS users to cause a denial of service data corruption, cause a data leak, or possibly gain privileges because coalescing of per-page IOMMU TLB flushes is mishandled...

UBUNTU-CVE-2020-27672

An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages...

UBUNTU-CVE-2020-25601

An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchnreset / evtchndestroy. In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these when resetting all event channels or when cleaning...

UBUNTU-CVE-2020-25600

An issue was discovered in Xen through 4.14.x. Out of bounds event channels are available to 32-bit x86 domains. The so called 2-level event channel model imposes different limits on the number of usable event channels for 32-bit x86 domains vs 64-bit or Arm either bitness ones. 32-bit x86 domain...

DEBIAN-CVE-2020-25595

An issue was discovered in Xen through 4.14.x. The PCI passthrough code improperly uses register data. Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device hardware registers. While devices strictly compliant with PCI specifications shouldn't ...

Xen Linux kernel privilege control vulnerability

Linux kernel is the kernel used by Linux, an open source operating system released by the Linux Foundation in the U.S. Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same...

DEBIAN-CVE-2020-15852

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tssinvalidateiobitmap mishandling causes a loss of synchronization between the I/O bitmaps ...

DEBIAN-CVE-2020-11743

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOPmapgrant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to retur...

dtc-xen competitive conditions issue vulnerability

dtc-xen is a SOAP daemon primarily used for control panel management of Xen VMs. A contention condition issue vulnerability exists in version 0.5.x prior to dtc-xen 0.5.4. The vulnerability stems from mishandling of concurrent access when concurrent code is required to access shared resources...

ALPINE-CVE-2019-17343

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges by leveraging incorrect use of the HVM physmap concept for PV domains...

DEBIAN-CVE-2019-17345

An issue was discovered in Xen 4.8.x through 4.11.x allowing x86 PV guest OS users to cause a denial of service because mishandling of failed IOMMU operations causes a bug check during the cleanup of a crashed guest...

UBUNTU-CVE-2018-19961

An issue was discovered in Xen through 4.11.x on AMD x86 platforms, possibly allowing guest OS users to gain host OS privileges because TLB flushes do not always occur after IOMMU mapping changes...

DEBIAN-CVE-2018-19967

An issue was discovered in Xen through 4.11.x on Intel x86 platforms allowing guest OS users to cause a denial of service host OS hang because Xen does not work around Intel's mishandling of certain HLE transactions associated with the KACQUIRE instruction prefix...

UBUNTU-CVE-2018-19966

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service host OS crash or possibly gain host OS privileges because of an interpretation conflict for a union data structure associated with shadow paging. NOTE: this issue exists because of an incorre...