RDMA/cxgb4: free STAG index when TPT entry write fails

Summary

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.

Timeline

1. Sep 17, 2026, 4:09 PM UTCCVE published
2. Oct 19, 2026, 9:03 AM UTCRecord last updated

Affected versions

• Linux Linux

  From ec3eead217181d7360a11317a888ceb30807867c · fixed in 5fe4731bfbd8d83c4a14b4af3a27329969ce8a99; From ec3eead217181d7360a11317a888ceb30807867c · fixed in 8f6976d635d190e3d7af7103daaa581cf1ccc12e; From ec3eead217181d7360a11317a888ceb30807867c · fixed in 9eeafcda1d6c11f0eec532243c4e96ec8c632bd7; From ec3eead217181d7360a11317a888ceb30807867c · fixed in 5a21e5114cec4cd3f8a2843d4c46bc49634d6e96; From ec3eead217181d7360a11317a888ceb30807867c · fixed in 2f17ca7ab5269ac2504e1039c3921373dccd7712; From ec3eead217181d7360a11317a888ceb30807867c · fixed in a2e37d1ab773be3cd26b1c19593ca2dbcece9c57; From ec3eead217181d7360a11317a888ceb30807867c · fixed in a64e2beb450179a5d43034af8d5476a11eac1486; From ec3eead217181d7360a11317a888ceb30807867c · fixed in fdfb5cea4bf070cdb31d997efd87bb684df041fd

• Linux Linux

  3.5

• KernelLinux

  From 3.5.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8