x86: CPU Opcode Cache corruption

ISSUE DESCRIPTION AMD have disclosed a potential vulnerability in certain CPUs which can cause instructions to execute at a higher privilege. For more information, see: https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7052.html IMPACT Code of any privilege could escalate to a...

DEBIAN-CVE-2020-25604

An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest also operating on the timers to release a lock that it...

Xen domain builder Out-of-memory due to malicious kernel/ramdisk

ISSUE DESCRIPTION The Xen PV domain builder contained no validation of the size of the supplied kernel or ramdisk either before or after decompression. This could cause the toolstack to consume all available RAM in the domain running the domain builder. CVE-2012-4544 Additionally, under similar...