In the Linux kernel, the following vulnerability has been resolved:
xen-netback: reject zero-queue configuration from guest
A malicious or buggy Xen guest can write "0" to the xenbus key "multi-queue-num-queues". The connect() function in the backend only validates the upper bound (requested_num_queues > xenvif_max_queues) but not zero, allowing requested_num_queues=0 to reach vzalloc(array_size(0, sizeof(struct xenvif_queue))), which triggers WARN_ON_ONCE(!size) in __vmalloc_node_range().
On systems with panic_on_warn=1, this allows a guest-to-host denial of service.
The Xen network interface specification requires the queue count to be "greater than zero".
Add a zero check to match the validation already present in xen-blkback, which has included this guard since its multi-queue support was added.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-livepatch-5.15.202-141.223Upgrade kernel-livepatch-5.10.252-250.992Upgrade kernel-headersUpgrade perf-debuginfoUpgrade perfUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-tools | Jun 17, 2026 | Jun 17, 2026 |
| Debian | — | Upgrade linux | May 28, 2026 | May 28, 2026 |
| Ubuntu | — | Upgrade linux-image-generic-64kUpgrade linux-image-nvidia-tegraUpgrade linux-image-5.15.0-1104-kvmUpgrade linux-image-lowlatency-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-fipsUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-generic-64k-6.8Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1058-gke-64kUpgrade linux-image-6.8.0-1045-gkeopUpgrade linux-image-6.8.0-2049-raspi-realtimeUpgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-5.15.0-186-genericUpgrade linux-image-ibm-classicUpgrade linux-image-oem-20.04bUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-azure-fips-6.8Upgrade linux-image-aws-64k-5.15Upgrade linux-image-fips-5.15Upgrade linux-image-gke-5.15Upgrade linux-image-6.8.0-134-fipsUpgrade linux-image-5.15.0-186-generic-lpaeUpgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-1062-azure-fipsUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-1058-nvidia-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-5.15.0-186-generic-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-raspi-realtimeUpgrade linux-image-kvm-5.15Upgrade linux-image-ibm-6.8Upgrade linux-image-6.8.0-1063-gcp-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-5.15.0-1104-intel-iot-realtimeUpgrade linux-image-6.8.0-1058-nvidia-lowlatencyUpgrade linux-image-6.8.0-1060-raspiUpgrade linux-image-5.15.0-1112-awsUpgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-oem-22.04aUpgrade linux-image-intelUpgrade linux-image-oem-22.04cUpgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-6.8.0-1060-aws-fipsUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-5.15.0-1112-gcpUpgrade linux-image-gkeopUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-generic-lpaeUpgrade linux-image-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-5.15Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1117-azure-fdeUpgrade linux-image-fips-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-oem-22.04bUpgrade linux-image-aws-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidiaUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-5.15.0-1112-aws-fipsUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-xilinxUpgrade linux-image-genericUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-ibmUpgrade linux-image-6.8.0-134-lowlatencyUpgrade linux-image-azure-fdeUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-5.15.0-1111-realtimeUpgrade linux-image-azure-lts-22.04Upgrade linux-image-gcp-fipsUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-6.8.0-1057-oracleUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-6.8.0-134-lowlatency-64kUpgrade linux-image-6.8.0-1058-nvidia-64kUpgrade linux-image-raspiUpgrade linux-image-azure-6.8Upgrade linux-image-gcp-6.8Upgrade linux-image-aws-64kUpgrade linux-image-oracleUpgrade linux-image-oem-20.04cUpgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1107-intel-iotgUpgrade linux-image-5.15.0-1109-oracleUpgrade linux-image-lowlatency-6.8Upgrade linux-image-5.15.0-1064-nvidia-tegra-rtUpgrade linux-image-gke-64kUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-xilinx-6.8Upgrade linux-image-oem-20.04Upgrade linux-image-generic-5.15Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-6.8.0-1058-gkeUpgrade linux-image-5.15.0-1075-xilinx-zynqmpUpgrade linux-image-nvidia-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-kvmUpgrade linux-image-gcp-5.15Upgrade linux-image-6.8.0-1063-gcp-fipsUpgrade linux-image-6.8.0-1060-aws-64kUpgrade linux-image-6.8.0-1058-nvidiaUpgrade linux-image-5.15.0-1112-aws-64kUpgrade linux-image-5.15.0-1107-nvidia-lowlatencyUpgrade linux-image-5.15.0-186-fipsUpgrade linux-image-azure-fde-5.15Upgrade linux-image-5.15.0-1053-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-1053-nvidia-tegra-igxUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-nvidia-tegra-igxUpgrade linux-image-generic-lpae-5.15Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-generic-64k-5.15Upgrade linux-image-azure-fips-5.15Upgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1063-gcpUpgrade linux-image-5.15.0-1107-nvidiaUpgrade linux-image-6.8.0-134-generic-64kUpgrade linux-image-awsUpgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-5.15Upgrade linux-image-6.8.0-1057-oracle-64kUpgrade linux-image-5.15.0-1117-azure-fipsUpgrade linux-image-5.15.0-1106-ibmUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1029-nvidia-tegraUpgrade linux-image-5.15.0-184-lowlatency-64kUpgrade linux-image-5.15.0-184-lowlatencyUpgrade linux-image-5.15.0-1117-azureUpgrade linux-image-5.15.0-1095-gkeopUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-virtual-6.8Upgrade linux-image-realtimeUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gkeUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-6.8.0-1060-awsUpgrade linux-image-azure-5.15Upgrade linux-image-lowlatency-5.15Upgrade linux-image-azure-fde-6.8Upgrade linux-image-6.8.0-136-genericUpgrade linux-image-6.8.0-1060-ibmUpgrade linux-image-6.8.0-1029-nvidia-tegra-rtUpgrade linux-image-5.15.0-1112-gcp-fipsUpgrade linux-image-virtual-5.15Upgrade linux-image-oem-22.04dUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-oracle-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-realtime-5.15Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.1-1055-realtimeUpgrade linux-image-5.15.0-1064-nvidia-tegraUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-azure-cvmUpgrade linux-image-oracle-5.15Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-laptop-23.10Upgrade linux-image-gke-64k-6.8Upgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-azureUpgrade linux-image-aws-fips-5.15Upgrade linux-image-6.8.0-134-genericUpgrade linux-image-5.15.0-1108-gkeUpgrade linux-image-realtime-6.8.1Upgrade linux-image-raspi-6.8Upgrade linux-image-ibm-5.15Upgrade linux-image-6.8.0-1063-azureUpgrade linux-image-intel-iotgUpgrade linux-image-gke-6.8Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-generic-64k-hwe-22.04 | Jul 2, 2026 | Jul 1, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 12, 2026 | May 27, 2026 |
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