CVSS: 7.0EPSS: 0%CPEs: 6EXPL: 0CVE-2020-25599 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-25599
23 Sep 2020 — An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •
CVSS: 5.5EPSS: 0%CPEs: 5EXPL: 0CVE-2020-25598
https://notcve.org/view.php?id=CVE-2020-25598
23 Sep 2020 — An issue was discovered in Xen 4.14.x. There is a missing unlock in the XENMEM_acquire_resource error path. The RCU (Read, Copy, Update) mechanism is a synchronisation primitive. A buggy error path in the XENMEM_acquire_resource exits without releasing an RCU reference, which is conceptually similar to forgetting to unlock a spinlock. A buggy or malicious HVM stubdomain can cause an RCU reference to be leaked. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html • CWE-670: Always-Incorrect Control Flow Implementation •
CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0CVE-2020-25597 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-25597
23 Sep 2020 — An issue was discovered in Xen through 4.14.x. There is mishandling of the constraint that once-valid event channels may not turn invalid. Logic in the handling of event channel operations in Xen assumes that an event channel, once valid, will not become invalid over the life time of a guest. However, operations like the resetting of all event channels may involve decreasing one of the bounds checked when determining validity. This may lead to bug checks triggering, crashing the host. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html • CWE-755: Improper Handling of Exceptional Conditions •
CVSS: 7.8EPSS: 0%CPEs: 6EXPL: 0CVE-2020-25595 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-25595
23 Sep 2020 — 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 be able to affect these registers, experience shows that it's very common for devices to have out-of-spec "backdoor" operations that can affect the result of these reads. A not fully trusted guest may be able to cra... • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html • CWE-269: Improper Privilege Management •
CVSS: 7.8EPSS: 0%CPEs: 5EXPL: 0CVE-2020-15852
https://notcve.org/view.php?id=CVE-2020-15852
20 Jul 2020 — 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 tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154. Se detectó un problema en el kernel de Linux versiones 5.5 hasta 5.7.9, como es usado en Xen versiones hasta 4.13.x para invitados PV x86. Un atacante puede otorgar los permi... • http://www.openwall.com/lists/oss-security/2020/07/21/2 • CWE-276: Incorrect Default Permissions •
CVSS: 7.8EPSS: 0%CPEs: 6EXPL: 0CVE-2020-15567 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-15567
07 Jul 2020 — An issue was discovered in Xen through 4.13.x, allowing Intel guest OS users to gain privileges or cause a denial of service because of non-atomic modification of a live EPT PTE. When mapping guest EPT (nested paging) tables, Xen would in some circumstances use a series of non-atomic bitfield writes. Depending on the compiler version and optimisation flags, Xen might expose a dangerous partially written PTE to the hardware, which an attacker might be able to race to exploit. A guest administrator or perhaps... • http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •
CVSS: 6.5EPSS: 0%CPEs: 4EXPL: 0CVE-2020-15564 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-15564
07 Jul 2020 — An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the gue... • http://www.openwall.com/lists/oss-security/2020/07/07/5 • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 8.8EPSS: 0%CPEs: 6EXPL: 0CVE-2020-15565 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-15565
07 Jul 2020 — An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs, a CPU cache also needs writing back to memory after changes were made. Such writing back of cached data was missing in particular ... • http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html • CWE-400: Uncontrolled Resource Consumption •
CVSS: 6.5EPSS: 0%CPEs: 5EXPL: 0CVE-2020-15563 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-15563
07 Jul 2020 — An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. • http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0CVE-2020-15566 – Ubuntu Security Notice USN-5617-1
https://notcve.org/view.php?id=CVE-2020-15566
07 Jul 2020 — An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a host OS crash because of incorrect error handling in event-channel port allocation. The allocation of an event-channel port may fail for multiple reasons: (1) port is already in use, (2) the memory allocation failed, or (3) the port we try to allocate is higher than what is supported by the ABI (e.g., 2L or FIFO) used by the guest or the limit set by an administrator (max_event_channels in xl cfg). Due to the missing error che... • http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html • CWE-754: Improper Check for Unusual or Exceptional Conditions •