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Search: “Xen Project”

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Xen Security Advisory 510 v3 (CVE-2026-79602) - x86: improper handling of HVM emulation return codes

Xen Project released XSA-510 (CVE-2026-79602) fixing mishandled HVM emulation return codes that let PCI-passthrough guests crash Xen.

Xen Security Advisory 510 v3 publicly discloses CVE-2026-79602, improper handling of HVM emulation return codes in the Xen hypervisor on x86. A guest with an assigned PCI device that has at least one BAR in the IO port space can trigger a BUG() in Xen. The advisory was released publicly as version 3.

oss-security · 8d agoVulnerability 4 sourcesCVE-2026-796021

Xen Security Advisory 512 v3 (CVE-2026-79604) - oxenstored: Unbounded accumulation of watches

Xen Project released XSA-512 (CVE-2026-79604) fixing unbounded accumulation of watches in oxenstored that can exhaust resources after xenbus reconnects.

Xen Security Advisory 512 v3 publicly discloses CVE-2026-79604 in oxenstored, the OCaml xenstore implementation. Oxenstored maintains a global trie and per-domain hashtable for watches, and on a xenbus reconnect requests the watches are not cleared out of the global structure. This allows unbounded accumulation of watches. The Xen security team published the advisory and fix as a public release.

oss-security · 8d agoVulnerability 4 sourcesCVE-2026-79604

Xen Security Advisory 511 v3 (CVE-2026-79603) - Unconditionally do TLB flushing ahead of page scrubbing

Xen Project released XSA-511 (CVE-2026-79603) fixing missing TLB flushes before page scrubbing that can leak x86 PV guest data.

Xen Security Advisory 511 v3 publicly discloses CVE-2026-79603, a TLB handling flaw in the Xen hypervisor on x86. x86 PV guests can free memory pages while a stale TLB entry still points to them, and Xen only flushes the TLB when the page is reused, potentially exposing stale data ahead of scrubbing. The advisory changes Xen to unconditionally flush the TLB ahead of page scrubbing. The issue was published in version 3 of the advisory.

oss-security · 8d agoVulnerability 4 sourcesCVE-2026-79603

Xen Security Advisory 509 v3 (CVE-2026-62437) - x86: DMs may cause mem leak by IRQ binding

Xen Project released XSA-509 (CVE-2026-62437) fixing a memory leak in IRQ tracking when guests with assigned PCI devices are terminated.

Xen Security Advisory 509 v3 publicly discloses CVE-2026-62437, a memory leak affecting the Xen hypervisor on x86. When guests are terminated, cleanup of PCI devices assigned to those guests and removal of associated IRQ tracking structures may fail, leaking memory. The advisory was released publicly as version 3.

oss-security · 8d agoVulnerabilityCVE-2026-62437