CVE-2026-64229 x86/mm: Disable broadcast TLB flush when PCID is disabled

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disable broadcast TLB flush when PCID is disabled Booting with "nopcid" clears X86FEATUREPCID and keeps CR4.PCIDE from being set to one. On AMD CPUs that support INVLPGB, broadcast TLB flushing remains enabled. There are...

PT-2019-4893 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen versions prior to 4.12 Description: The issue is related to an incompatibility between Process Context Identifiers PCID and TLB flushes, allowing x86 PV guest OS users to cause a denial of service or gain privileges. This is due to...