CVE-2026-90415
UnknownSummary
In the Linux kernel, the RDMA/cxgb4 module leaks a STAG index when a TPT entry write fails. The write_tpt_entry() function allocates a STAG index but on write_adapter_mem() failure does not release it or reverse the statistics, leading to a leak until device teardown.
Risk Assessment
Leaking STAG indices can lead to hardware resource exhaustion and inability to register new memory regions. Over time, this may force a device or system restart.
Recommendation
Update the Linux kernel to a version containing the fix that returns the STAG index to tpt_table and decrements stats.stag.cur on write failure. Updating cxgb4 RDMA drivers is recommended.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS