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 kernel6.18-modules-extra-commonUpgrade kernel6.18-tools-develUpgrade kernel6.18-toolsUpgrade microvm-kernel6.18Upgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.18Upgrade kernel6.18-headersUpgrade bpftool6.18-debuginfoUpgrade python3-perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade perf6.18Upgrade kernel6.18-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade bpftool6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel-livepatch-6.18.36-69.134Upgrade kernel6.18-devel | Jul 21, 2026 | Jun 25, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jun 25, 2026 |
| Ubuntu | — | Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gke-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-gkeUpgrade linux-image-realtime-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-gcp-64kUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-azure-lts-26.04Upgrade linux-image-raspiUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-gke-64kUpgrade linux-image-genericUpgrade linux-image-generic-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-oem-26.04bUpgrade linux-image-oracleUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-nvidiaUpgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-aws-64kUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-realtime-64kUpgrade linux-image-virtualUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-azure-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-awsUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-raspi-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-ibmUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-gcpUpgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-azureUpgrade linux-image-generic-7.0Upgrade linux-image-realtime | Sep 14, 2026 | Sep 7, 2026 |
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