CVE-2026-98149
UnknownSummary
In the Linux kernel, the BPF subsystem's per-CPU map update paths (array, hash, cgroup storage) without BPF_F_CPU or BPF_F_ALL_CPUS use the logical CPU ID to compute the buffer offset instead of a dense offset. With sparse CPU IDs (e.g. mask 0,2-3), this causes incorrect per-CPU values and an out-of-bounds read from the update buffer for CPU3.
Risk Assessment
Incorrect per-CPU values can lead to wrong decisions by BPF programs, and the out-of-bounds buffer read can cause kernel errors or data exposure, posing a risk to system stability and security.
Recommendation
Update the Linux kernel to a version with the fix that uses a dense offset iterated over possible CPUs in the array, hash, and cgroup storage update paths, matching the lookup paths.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix percpu map update indexing with sparse CPU IDs Per-CPU array, hash, and cgroup storage map updates without BPF_F_CPU or BPF_F_ALL_CPUS use a value buffer whose per-CPU slots are packed in possible-CPU order. The buffer is sized as: round_up(value_size, 8) * num_possible_cpus() The update paths iterate over possible CPUs, but use the logical CPU ID to calculate the source offset: value + size * cpu This only works when possible CPU IDs are contiguous starting at zero. For example, with a possible CPU mask of 0,2-3, the buffer contains three slots corresponding to CPUs 0, 2, and 3. CPU2 is therefore expected to use slot 1 and CPU3 slot 2. Instead, the current code uses slots 2 and 3 respectively, causing incorrect per-CPU values and an out-of-bounds read from the update buffer for CPU3. The corresponding lookup paths already use a dense offset while iterating over possible CPUs. Do the same for the array, hash, and cgroup storage update paths, advancing the source offset once for each possible CPU. BPF_F_ALL_CPUS continues to use the same value for every CPU.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS