{"cve":"CVE-2026-80983","nvd":{"published":"2026-09-11T20:19:04.787","modified":"2026-10-19T09:17:30.807","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix socket refcount leak in smc_switch_conns()\n\nsmc_switch_conns() takes a reference on the SMC socket before dropping\nlgr->conns_lock, so the connection stays alive while the CDC slot is\nfetched:\n\n        sock_hold(&smc->sk);\n        read_unlock_bh(&lgr->conns_lock);\n        /* pre-fetch buffer outside of send_lock, might sleep */\n        rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);\n        if (rc)\n                goto err_out;\n\nThe err_out label only drops the wr_tx link reference, so this early exit\nreturns without the matching sock_put(). The second error exit is not\naffected, because sock_put() has already run by then.\n\nA leaked sk_refcnt means the smc_sock is never destroyed. Its send and\nreceive buffers stay allocated, and for a user socket the reference held\non the network namespace is never released, so the netns can no longer be\ntorn down.\n\nsmc_cdc_get_free_slot() fails when the target link goes down or when the\nconnection has been killed while the switch is in progress. Both are\nreachable during the link failover this function implements, so the leak\nis triggered by the same hardware events that make smc_switch_conns() run\nin the first place.\n\nRestructure so there is a single sock_put() covering both outcomes,\ninstead of adding a second one to the error path.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/09d7a9e162ee1a269878c126aee3d7eff43e4130","https://git.kernel.org/stable/c/719296c4aa8213d4ac8002e77d5956d436bc98d0","https://git.kernel.org/stable/c/84dea0585f6b538ae895a8b1d025f4897737f3b1","https://git.kernel.org/stable/c/a3378466704e0bbe93aef9769552dca7673a7eb6","https://git.kernel.org/stable/c/d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-80983","score":0.00173,"percentile":0.06626,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}