In the Linux kernel, the following vulnerability has been resolved:
cgroup/rstat: validate cpu before css_rstat_cpu() access
css_rstat_updated() is exposed as a BPF kfunc and accepts a caller-provided cpu argument. The function uses cpu for per-cpu rstat lookups without checking whether it refers to a valid possible CPU.
A BPF iter/cgroup program with CAP_BPF and CAP_PERFMON can pass an invalid cpu value. On an unfixed UBSCAN_BOUNDS test kernel, cpu == 0x7fffffff triggers:
UBSAN: array-index-out-of-bounds in kernel/cgroup/rstat.c:31:9 index 2147483647 is out of range for type 'long unsigned int [64]' Call Trace: css_rstat_updated bpf_iter_run_prog cgroup_iter_seq_show bpf_seq_read
Add cpu validation to the BPF-facing css_rstat_updated() kfunc and move the common implementation to __css_rstat_updated() for in-kernel callers.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-develUpgrade bpftool6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-toolsUpgrade python3-perf6.18-debuginfoUpgrade microvm-kernel6.18Upgrade kernel6.18-tools-debuginfoUpgrade python3-perf6.18Upgrade perf6.18Upgrade kernel6.18-modules-extraUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-tools-develUpgrade bpftool6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-debuginfoUpgrade kernel6.18Upgrade kernel6.18-headersUpgrade kernel-livepatch-6.18.35-68.127 | Aug 10, 2026 | Jul 19, 2026 |
| Redhat_linux | — | No solution exists | Jul 22, 2026 | Jul 19, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1009-awsUpgrade linux-image-oracleUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1010-azureUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-azure-fde-7.0Upgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-ibmUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-azure-fdeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-awsUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidiaUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-6.8.0-1036-nvidia-tegraUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-raspiUpgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-nvidia-tegraUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-6.8.0-1036-nvidia-tegra-rtUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-azure-7.0Upgrade linux-image-gcpUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-nvidia-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-azureUpgrade linux-image-aws-64kUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-nvidia-bosUpgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-7.0.0-1010-ibm | Jul 21, 2026 | Jul 20, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 21, 2026 | Jul 19, 2026 |
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