CVE-2026-53133
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, a vulnerability in RDMA/umem was found where using iommu with large mapping blocks (>=4G) split across multiple SG entries caused overflow of 32-bit stack values, leading to incorrect DMA address calculation for blocks after truncation.
Risk Assessment
The organization may experience incorrect RDMA memory operations, potentially leading to data corruption or system crashes in environments using large memory blocks.
Recommendation
Immediately update the Linux kernel to a version containing the fix that uses appropriate types for storing DMA addresses.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Fix truncation for block sizes >= 4G When the iommu is used the linearization of the mapping can give a single block that is very large split across multiple SG entries. When __rdma_block_iter_next() reassembles the split SG entries it is overflowing the 32 bit stack values and computed the wrong DMA addresses for blocks after the truncation. Use the right types to hold DMA addresses.