CVE-2026-62437: x86: DMs may cause mem leak by IRQ binding

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-09-10
Weakness: CWE-362

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 point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.

References

https://xenbits.xenproject.org/xsa/advisory-509.html
http://www.openwall.com/lists/oss-security/2026/09/08/6
http://xenbits.xen.org/xsa/advisory-509.html

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