Summary
It was discovered that the UHCI controller implementation of QEMU could be
brought into an invalid state. An attacker inside the guest could possibly
use this issue to cause QEMU to crash, resulting in a denial of service.
(CVE-2024-8354)
It was discovered that QEMU incorrectly handled memory during certain VNC
operations. An remote attacker could possibly use this issue to cause QEMU
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2025-11234)
It was discovered that the e1000 network device implementation of QEMU
could be made to write out of bounds. An attacker inside the guest could
possibly use this issue to cause QEMU to crash, resulting in a denial of
service, or possibly execute arbitrary code. This issue only affected
Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-12464)
It was discovered that the virtio-crypto device implementation of QEMU did
not limit the length of a certain path input. An attacker inside the guest
could possibly use this issue to cause QEMU to consume large amount of
memory, resulting in a denial of service. This issue only affected Ubuntu
24.04 LTS and Ubuntu 25.10. (CVE-2025-14876)
It was discovered that the KVM Xen guest support of QEMU could be made to
read out of bounds. An attacker inside the guest could possibly use this
issue to cause QEMU to crash, resulting in a denial of service. This issue
only affected Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-0665)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | qemu | 1:6.2+dfsg-2ubuntu6.28 |
| Ubuntu · 24.04 LTS 24.04:LTS | qemu | 1:8.2.2+ds-0ubuntu1.13 |
| Ubuntu · 25.10 | qemu | 1:10.1.0+ds-5ubuntu2.4 |
Vulnerabilities 5
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High 7.5
Qemu-kvm: vnc websocket handshake use-after-free
A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by…
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Medium 6.5
Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq
An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memor…
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Medium 6.2
Qemu-kvm: stack buffer overflow in e1000 device via short frames in loopback mode
A stack-based buffer overflow was found in the QEMU e1000 network device. The code for padding short frames was dropped from individual network devices and moved to the net core code. The issue stems from the device's receive code still being able to process …
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Medium 5.5
Qemu-kvm: usb: assertion failure in usb_ep_get()
A flaw was found in QEMU. An assertion failure was present in the usb_ep_get() function in hw/net/core.c when trying to get the USB endpoint from a USB device. This flaw may allow a malicious unprivileged guest user to crash the QEMU process on the host and c…
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Medium 5.5
Qemu-kvm: unbounded allocation in virtio-crypto
A flaw was found in the virtio-crypto device of QEMU. A malicious guest operating system can exploit a missing length limit in the AKCIPHER path, leading to uncontrolled memory allocation. This can result in a denial of service (DoS) on the host system by cau…