CVE-2026-81627: Out-of-bounds Write

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset DLCK protection and injecting code...

PT-2026-95354

Name of the Vulnerable Software and Affected Versions QEMU affected versions not specified Description A flaw exists in the VAPIC setup hypercall within hw/i386/vapic.c that fails to validate whether the writable RAM alias stays within the option ROM window. A privileged guest user on a Q35/KVM...

EulerOS Virtualization 2.11.0 : qemu (EulerOS-SA-2026-3572)

According to the versions of the qemu packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A flaw was found in QEMU's virtio-blk device. The issue arises because the device does not properly validate the size of input...

Astra Linux – Vulnerability in Qemu

A flaw was discovered in qemu. A host privilege escalation issue was identified in the virtio-fs shared file system daemon, where a privileged guest user is able to create a device-specific special file in the shared directory and use it to gain read/write access to host devices...

Astra Linux – Vulnerability in Qemu

A use-after-free vulnerability was discovered in the am53c974 SCSI host bus adapter emulation in QEMU in versions prior to 6.0.0, during the handling of the ‘Information Transfer’ command CMDTI. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial ...

Astra Linux – Vulnerability in Qemu

A reachable assertion issue was detected in the USB EHCI emulation code of QEMU. This issue can occur during the processing of USB requests due to a faulty handling of the DMA memory map. A malicious privileged user within the guest environment may exploit this flaw to send invalid USB requests,...

Astra Linux – Vulnerability in Qemu

A out-of-bounds heap buffer access issue was identified in the ARM Generic Interrupt Controller emulator of QEMU, as of and including qemu 4.2.0 on the aarch64 platform. The issue arises because, when writing an interrupt ID to the controller’s memory area, it is not masked to be 4 bits wide. Thi...

Astra Linux – Vulnerability in Qemu

A use-after-free vulnerability was discovered in the LSI53C895A SCSI Host Bus Adapter emulation in QEMU. The flaw occurs during the processing of repeated messages to cancel the current SCSI request using the lsidomsgout function. This flaw allows a malicious privileged user within the guest to...

Astra Linux – Vulnerability in Qemu

A double-free vulnerability was identified in QEMU virtio devices virtio-gpu, virtio-serial-bus, virtio-crypto. The memreentrancyguard flag does not provide sufficient protection against reentrancy issues related to DMA operations. This vulnerability could allow a malicious privileged guest user ...

Astra Linux – Vulnerability in Qemu

A flaw was discovered in the QXL display device emulation in QEMU. An integer overflow in the cursoralloc function can lead to the allocation of a small cursor object, followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process...

Astra Linux – Vulnerability in Qemu

A flaw was discovered in the QXL display device emulation in QEMU. The double retrieval of the guest-controlled values cursor-header.width and cursor-header.height can lead to the allocation of a small cursor object, followed by a subsequent heap-based buffer overflow. A malicious privileged gues...

Astra Linux – Vulnerability in Qemu

It was found that the patch for CVE-2020-17380/CVE-2020-25085 is ineffective. As a result, QEMU becomes vulnerable to out-of-bounds read/write access issues that were previously identified in the SDHCI controller emulation code. This flaw allows a malicious privileged attacker to crash the QEMU...

New Zapscape KVM Flaw Could Let Privileged L1 Guest Code Escape to Linux Hosts

Zapscape , a new Linux kernel vulnerability, could allow an attacker with kernel privileges inside an L1 guest virtual machine VM to escape KVM isolation and execute code on the host. The risk applies when nested virtualization is exposed to untrusted guests. The flaw is tracked as CVE-2026-64561...

XenServer Security Update for Multiple Issues

Severity :High Description of Problem Several issueshave beenidentifiedthat affect XenServer 8.4 and XenServer 9. Collectively, these issues may allowa malicious privileged userin a guest VM to compromise or crash the host. Theseissueshavethe following identifiers: CVE-2026-42492XenServer 9 only...

TencentOS Server 4: libslirp (TSSA-2026:0617)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0617 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:...

SUSE CVE-2026-9539

An out-of-bounds heap read and integer underflow in the TCP urgent data handling sosendoob in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments e.g., QEMU allows a privileged guest VM attacker root or CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

UBUNTU-CVE-2026-9539

An out-of-bounds heap read and integer underflow in the TCP urgent data handling sosendoob in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments e.g., QEMU allows a privileged guest VM attacker root or CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

EUVD-2026-38654

An out-of-bounds heap read and integer underflow in the TCP urgent data handling sosendoob in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments e.g., QEMU allows a privileged guest VM attacker root or CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

CVE-2026-9539

An out-of-bounds heap read and integer underflow in the TCP urgent data handling sosendoob in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments e.g., QEMU allows a privileged guest VM attacker root or CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

CVE-2026-9539

CVE-2026-9539 affects freedesktop.org libslirp (prior to v4.9.2) used on hypervisor host environments (e.g., QEMU). A vulnerability in the TCP urgent data handling (sosendoob) can cause an out-of-bounds heap read and integer underflow, enabling a privileged guest VM attacker (root or CAP_NET_RAW)...