SB2026030515 - Ubuntu update for qemu
Published: March 5, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 vulnerabilities.
1) Reachable assertion (CVE-ID: CVE-2024-8354)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion within the usb_ep_get() function in hw/net/core.c when trying to get the USB endpoint from a USB device. A remote attacker can perform a denial of service (DoS) attack.
2) Use-after-free (CVE-ID: CVE-2025-11234)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in websocket handshake code in /io/channel-websock.c. A remote attacker with network access to the VNC WebSocket port can perform a denial of service during the WebSocket handshake prior to the VNC client authentication.
3) Stack-based buffer overflow (CVE-ID: CVE-2025-12464)
CWE-ID: CWE-121 - Stack-based buffer overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service attack.
The vulnerability exists due to a boundary error within the e1000_receive_iov() function. A local user or malicious guest can send a short frame in loopback mode, trigger a stack-based buffer overflow and perform a denial of service attack.
4) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2025-14876)
CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:H/E:U/U:Clear
The vulnerability allows a malicious guest to perform a denial of service attack.
The vulnerability exists due to uncontrolled memory allocation in the virtio-crypto device in hw/virtio/virtio-crypto.c. A malicious guest can consume all available memory resources and terminate the QEMU process.
5) Off-by-one (CVE-ID: CVE-2026-0665)
CWE-ID: CWE-193 - Off-by-one Error
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:H/E:U/U:Clear
The vulnerability allows a malicious guest to perform a denial of service attack.
The vulnerability exists due to an off-by-one error within the KVM Xen guest support in hw/i386/kvm/xen_evtchn.c. A malicious guest can trigger an off-by-one error and perform a denial of service attack.
Remediation
Install update from vendor's website.