In the Linux kernel, the following vulnerability has been resolved:
RDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc
The cpu_id attribute supplied by user space through UVERBS_ATTR_ALLOC_DMAH_CPU_ID is passed directly to cpumask_test_cpu() without first verifying that the value is within the valid CPU range.
Passing such untrusted data to cpumask_test_cpu() may lead to an out-of-bounds read of the underlying cpumask bitmap: the helper expands to a test_bit() that indexes the bitmap by cpu_id / BITS_PER_LONG with no bound check.
In addition, on kernels built with CONFIG_DEBUG_PER_CPU_MAPS it trips the WARN_ON_ONCE() in cpumask_check(); combined with panic_on_warn this turns a bad user input into a machine reboot.
Reject any cpu_id that is not smaller than nr_cpu_ids with -EINVAL before it is used.
Reported by Smatch.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.18Upgrade kernel6.18-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade python3-perf6.18Upgrade kernel6.18-develUpgrade bpftool6.18Upgrade kernel-livepatch-6.18.36-69.134Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-debuginfo-common-x86_64Upgrade bpftool6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade perf6.18-debuginfoUpgrade microvm-kernel6.18Upgrade kernel6.18-toolsUpgrade kernel6.18-modules-extraUpgrade kernel6.18-headersUpgrade kernel6.18Upgrade kernel6.18-tools-develUpgrade kernel6.18-modules-extra-common | Jul 21, 2026 | Jun 25, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jun 25, 2026 |
| Ubuntu | — | Upgrade linux-image-azure-7.0Upgrade linux-image-gcpUpgrade linux-image-generic-64k-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-realtime-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-awsUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-realtimeUpgrade linux-image-raspi-realtimeUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-raspi-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-azureUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-oem-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-ibmUpgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-virtualUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-azure-lts-26.04Upgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-realtime-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gke-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-nvidia-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-oem-26.04aUpgrade linux-image-nvidiaUpgrade linux-image-aws-64k-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-gkeUpgrade linux-image-aws-64kUpgrade linux-image-oracleUpgrade linux-image-oem-26.04bUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-raspiUpgrade linux-image-generic-64kUpgrade linux-image-genericUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-1011-oracle-64k | Sep 14, 2026 | Sep 7, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub