CVE-2026-79603

The Xen hypervisor is vulnerable to a flaw where x86 paravirtualized (PV) guests can free memory pages while a stale Translation Lookaside Buffer (TLB) entry still points to them. Because Xen only issues a TLB flush when a page is reused, a window exists where a PV guest can modify an already scr...

CVE-2026-79603 Unconditionally do TLB flushing ahead of page scrubbing

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...

CVE-2026-79603 Unconditionally do TLB flushing ahead of page scrubbing

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...

EUVD-2026-72721

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...

CVE-2026-79602 x86: improper handling of HVM emulation return codes

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen...

CVE-2026-79602 x86: improper handling of HVM emulation return codes

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen...

CVE-2026-79602

A flaw exists in the Xen hypervisor where a malicious guest operating system with an assigned PCI device featuring a Base Address Register (BAR) mapped to the I/O port space can trigger an internal BUG() . This vulnerability is caused by the improper handling of HVM emulation return codes . The i...

EUVD-2026-72720

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen...

EUVD-2026-72719

When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest...

UBUNTU-CVE-2026-79602

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen...

UBUNTU-CVE-2026-62437

When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest...

CVE-2026-79603

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...

CVE-2026-79602

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen...

CVE-2026-62437

When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest...

UBUNTU-CVE-2026-79603

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...

x86: DMs may cause mem leak by IRQ binding

ISSUE DESCRIPTION When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that...

Unconditionally do TLB flushing ahead of page scrubbing

ISSUE DESCRIPTION x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify ...

x86: improper handling of HVM emulation return codes

ISSUE DESCRIPTION A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG in Xen. IMPACT Passing through a PCI device with at least one BAR in IO address space to unprivileged HVM guests can result in a Denial of Service DoS affecting the entire host...

Linux Distros Unpatched Vulnerability : CVE-2026-79604

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - xen - None Ubuntu Linux - oxenstored: Unbounded accumulation of watches: Oxenstored maintains two datastructures about watches; one global trie,...

CVE-2026-79603: Improper Control of a Resource Through its Lifetime

x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen if needed when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbe...