Medium [CVE-2026-80983] Linux kernel: net/smc socket reference leak leads to Denial of Service
This medium-severity Red Hat Linux advisory covers CVE-2026-80983.
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Summary
A flaw was found in the Linux kernel's implementation of the Server Message Block (SMB) over Remote Direct Memory Access (RDMA) protocol, specifically within the `net/smc` component. An error path in the `smc_switch_conns()` function, triggered during link failover events, can lead to a socket reference count leak.
This prevents the affected socket from being properly destroyed, causing its associated send and receive buffers to remain allocated. Consequently, the network namespace cannot be fully released, potentially resulting in a Denial of Service (DoS) due to resource exhaustion.
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-911.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 17 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 17 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 17 minutes ago·verify at source
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