CVE-2026-97477 is a vulnerability in Linux Kernel
Published on September 24, 2026
RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind()
In the Linux kernel, the following vulnerability has been resolved:
RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind()
When __rdma_counter_bind_qp() fails in alloc_and_bind(), the error path
jumps to err_mode which frees the counter without decrementing
port_counter->num_counters. The only place that decrements is
rdma_counter_free(), which is unreachable since the counter was never
successfully bound.
This leak accumulates across repeated failures, permanently preventing
the port from switching to AUTO mode (-EBUSY in __counter_set_mode())
and blocking the MANUALNONE auto-revert in rdma_counter_free(). When
the mode was NONE before the call, the MANUAL mode set by
__counter_set_mode() also leaks since the revert logic is never
reached.
Add an err_bind label between the num_counters increment and the
existing err_mode label. It decrements num_counters and mirrors the
MANUALNONE revert from rdma_counter_free(), ensuring the port state
is fully restored on bind failure.
Products Associated with CVE-2026-97477
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below da95cb016812c0e012ea839f191926e35ca8f57f is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd is affected.
- Before 6.18.53 is affected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2, <= * is unaffected.