CVE-2026-74396
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
In the Linux kernel, in the RDMA/mlx5 driver, mlx5r_umr_update_xlt() leaked the XLT buffer and DMA mapping when mlx5_odp_populate_xlt() returned an error, and also left the emergency mutex locked. The fix breaks out of the loop to execute the common cleanup path.
Risk Assessment
The vulnerability leads to memory and DMA resource leaks, which can cause system crashes or resource exhaustion.
Recommendation
Apply the Linux kernel update containing the fix for CVE-2026-74396.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure mlx5r_umr_update_xlt() allocates and DMA maps an XLT buffer with mlx5r_umr_create_xlt(). The buffer is released by the common cleanup path through mlx5r_umr_unmap_free_xlt(). After mlx5_odp_populate_xlt() became fallible, its error path returned directly and skipped that cleanup. This leaks the XLT DMA mapping and buffer. If the emergency XLT page was used, it also leaves xlt_emergency_page_mutex locked. Break out of the loop so execution falls through the existing cleanup path.