CVE-2026-72006
N/A
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5: free mlx5_st_idx_data on final dealloc
Workloads that repeatedly allocate and release mkeys carrying TPH steering-tag hints (e.g. churning RDMA MRs) leak one struct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced and the kmalloc slab grows over time.
When the last reference to an ST table entry is dropped, mlx5_st_dealloc_index() removed the entry from idx_xa but the backing mlx5_st_idx_data allocation was never freed.
Free idx_data after the xa_erase() so the lifetime of the bookkeeping struct matches the lifetime of the ST entry it tracks.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 888a7776f4fb04c19bec70c737c61c2f383c6b1e < 262da8b6ea03d01ee7ed01ad309e4c89941f6b14 | affected |
| Linux | Linux | 888a7776f4fb04c19bec70c737c61c2f383c6b1e < 6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75 | affected |
| Linux | Linux | 888a7776f4fb04c19bec70c737c61c2f383c6b1e < df6134b527a88b3e65ba6ae5073664af091d5fd2 | affected |
| Linux | Linux | 6.17 | affected |
| Linux | Linux | 0 < 6.17 | unaffected |
| Linux | Linux | 6.18.40 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.5 <= 7.1.* | unaffected |
| Linux | Linux | 7.2-rc4 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14
- https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75
- https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.