RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97477
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:25 UTC
Updated2026-09-28 06:16:33 UTC
DescriptionIn 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 MANUAL→NONE 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 MANUAL→NONE revert from rdma_counter_free(), ensuring the port state is fully restored on bind failure.

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.059530000 (date 2026-09-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8bc205eff3056a9ed3850937cdd2192f05e6d3cb da95cb016812c0e012ea839f191926e35ca8f57f git Not specified
CNA Linux Linux affected 8bc205eff3056a9ed3850937cdd2192f05e6d3cb 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/da95cb016812c0e012ea839f191926e35ca8f57f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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