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    CVE-2011-1751

    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."

    Published:May 18, 2011
    Last Modified:Apr 11, 2025
    EPS:Jun 21, 2012
    EPSS Score:0.00371
    CVSS Score:7.4

    Affected Products

    Vendor
    Qemu
    Product
    Qemu
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-100 Overflow Buffers
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-123 Buffer Manipulation
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-44 Overflow Binary Resource File
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

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    CVE-2026-51082 (CVSS 7.2) — A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-…
    CVE-2026-3842 (CVSS 7.8) — A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write d…
    CVE-2026-12080 (CVSS 7.3) — A flaw was found in the QEMU Guest Agent (qga). A local unprivileged user can exploit a vulnerability in the g…
    CVE-2026-3195 (CVSS 7.4) — A flaw was found in QEMU. When reading input audio in the virtio-snd device input callback, the `virtio_snd_pc…
    CVE-2026-3196 (CVSS 5.5) — An integer overflow vulnerability was found in the virtio-snd device via PCM_INFO requests from the guest. A m…
    CVE-2025-54566 (CVSS 4.2) — hw/pci/pcie_sriov.c in QEMU through 10.0.3 has a migration state inconsistency, a related issue to CVE-2024-26…
    CVE-2025-54567 (CVSS 4.2) — hw/pci/pcie_sriov.c in QEMU through 10.0.3 mishandles the VF Enable bit write mask, a related issue to CVE-202…
    CVE-2024-6519 (CVSS 8.2) — A use-after-free vulnerability was found in the QEMU LSI53C895A SCSI Host Bus Adapter emulation. This issue ca…
    CVE-2024-8354 (CVSS 5.5) — A flaw was found in QEMU. An assertion failure was present in the usb_ep_get() function in hw/net/core.c when …

    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
    http://secunia.com/advisories/44393
    http://secunia.com/advisories/44458
    http://secunia.com/advisories/44648
    http://secunia.com/advisories/44658
    http://secunia.com/advisories/44660
    http://secunia.com/advisories/44900
    http://www.openwall.com/lists/oss-security/2011/05/19/2
    http://www.osvdb.org/73395
    http://www.securityfocus.com/bid/47927
    https://bugzilla.redhat.com/show_bug.cgi?id=699773
    https://github.com/nelhage/virtunoid
    https://hermes.opensuse.org/messages/8572547
    https://www.ubuntu.com/usn/USN-1145-1/
    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
    http://secunia.com/advisories/44393
    http://secunia.com/advisories/44458
    http://secunia.com/advisories/44648
    http://secunia.com/advisories/44658
    http://secunia.com/advisories/44660
    http://secunia.com/advisories/44900
    http://www.openwall.com/lists/oss-security/2011/05/19/2
    http://www.osvdb.org/73395
    http://www.securityfocus.com/bid/47927
    https://bugzilla.redhat.com/show_bug.cgi?id=699773
    https://github.com/nelhage/virtunoid
    https://hermes.opensuse.org/messages/8572547
    https://www.ubuntu.com/usn/USN-1145-1/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High