CVE-2026-72006net/mlx5: free mlx5_st_idx_data on final dealloc
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 888a7776f4fb04c19bec70c737c61c2f383c6b1e builds before 262da8b6ea03d01ee7ed01ad309e4c89941f6b14; 888a7776f4fb04c19bec70c737c61c2f383c6b1e builds before 6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75; from 888a7776f4fb04c19bec70c737c61c2f383c6b1e before df6134b527a88b3e65ba6ae5073664af091d5fd2 | CNA record |
References
- https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14
- https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75
- https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.