CVE-2026-90415

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: free STAG index when TPT entry write fails write_tpt_entry() allocates a new STAG index with c4iw_get_resource() and bumps stats.stag.cur before programming the entry. When write_adapter_mem() fails, it returns the error without releasing the index or reversing the statistic. No MR is inserted into rhp->mrs, so deregistration never reclaims it, leaking the index until device teardown. Record whether this call allocated the index and, on a failed write, return it to tpt_table and decrement stats.stag.cur. Key the rollback on both the write error and that flag, not the error alone: a non-reset update carries a caller-owned STAG that this call did not allocate and must not free.

References

• https://git.kernel.org/stable/c/2f17ca7ab5269ac2504e1039c3921373dccd7712
• https://git.kernel.org/stable/c/5a21e5114cec4cd3f8a2843d4c46bc49634d6e96
• https://git.kernel.org/stable/c/5fe4731bfbd8d83c4a14b4af3a27329969ce8a99
• https://git.kernel.org/stable/c/8f6976d635d190e3d7af7103daaa581cf1ccc12e
• https://git.kernel.org/stable/c/9eeafcda1d6c11f0eec532243c4e96ec8c632bd7