kernel: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix hugepmdunshare vs GUP-fast race hugepmdunshare drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in...

Linux Distros Unpatched Vulnerability : CVE-2020-15565

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Kernel Security Vulnerabilities

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from a competition between hugepmdunshare and GUP-fast, which could lead to page table sharing issues...

SUSE CVE-2020-15565

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...

missed flush in XSA-321 backport

ISSUE DESCRIPTION An oversight was made when backporting XSA-321, leading entries in the IOMMU not being properly updated under certain circumstances. IMPACT A malicious guest may be able to retain read/write DMA access to frames returned to Xen's free pool, and later reused for another purpose...

CVE-2020-15565

A flaw was found in Xen, in the page table sharing between the IOMMU and CPU. This flaw allows a malicious guest user to access sensitive information pertaining to other guests to crash the host, resulting in a denial of service and privilege escalation. The highest threat from this vulnerability...

DEBIAN-CVE-2020-15565

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...

CVE-2020-15565

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...

CVE-2020-15565

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...

Design/Logic Flaw

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...

CVE-2020-15565

Root cause: CVE-2020-15565 arises from insufficient cache write-back under VT-d when page tables are shared between IOMMU and CPU, requiring flushing of both CPU and IOMMU TLBs. A backport/backing fixes missed a necessary cache flush, leaving IOMMU updates potentially non-coherent. Affected produ...

insufficient cache write-back under VT-d

ISSUE DESCRIPTION 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 CPU cached also needs writing back to memory after changes were made. Such writing back of cached dat...

PT-2020-14495

Name of the Vulnerable Software and Affected Versions Xen versions prior to 4.13.x Description The issue allows 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...