{"cve":"CVE-2011-1751","nvd":{"published":"2012-06-21T15:55:09.613","modified":"2026-06-16T23:29:57.323","status":"Modified","description":"The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to \"active qemu timers.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://blog.nelhage.com/2011/08/breaking-out-of-kvm/","http://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219d0ec1362b760d71cb4fdca","http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html","http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html","http://rhn.redhat.com/errata/RHSA-2011-0534.html"],"products":["qemu:qemu"],"source":"nvd","synced_at":"2026-10-19T20:24:00.973572543+00:00"},"epss":{"cve":"CVE-2011-1751","score":0.00741,"percentile":0.54668,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}