CVE-2026-80983

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80983", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:42.912Z", "dateUpdated": "2026-10-30T12:31:34.279Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:31:34.279Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_core.c"], "versions": [{"version": "99f19566b1c4d3dc4d934ee2ef43faadebb56d70", "lessThan": "8cb289eb764ff18000a33ddbc287d676d8597eea", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "a3378466704e0bbe93aef9769552dca7673a7eb6", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "e20227019d9da73f8fdf16f0951c2e188c84933f", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "09d7a9e162ee1a269878c126aee3d7eff43e4130", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "84dea0585f6b538ae895a8b1d025f4897737f3b1", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "d9a879ac25958bdaecb669ce70e58f8e2ff170de", "status": "affected", "versionType": "git"}, {"version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "lessThan": "719296c4aa8213d4ac8002e77d5956d436bc98d0", "status": "affected", "versionType": "git"}, {"version": "0d9ddf515cde793841f738490037560fd6559c63", "status": "affected", "versionType": "git"}, {"version": "5.10.90", "lessThan": "5.10.273", "status": "affected", "versionType": "semver"}, {"version": "5.14.14", "lessThan": "5.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_core.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.90", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8cb289eb764ff18000a33ddbc287d676d8597eea"}, {"url": "https://git.kernel.org/stable/c/a3378466704e0bbe93aef9769552dca7673a7eb6"}, {"url": "https://git.kernel.org/stable/c/e20227019d9da73f8fdf16f0951c2e188c84933f"}, {"url": "https://git.kernel.org/stable/c/09d7a9e162ee1a269878c126aee3d7eff43e4130"}, {"url": "https://git.kernel.org/stable/c/84dea0585f6b538ae895a8b1d025f4897737f3b1"}, {"url": "https://git.kernel.org/stable/c/d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d"}, {"url": "https://git.kernel.org/stable/c/d9a879ac25958bdaecb669ce70e58f8e2ff170de"}, {"url": "https://git.kernel.org/stable/c/719296c4aa8213d4ac8002e77d5956d436bc98d0"}], "title": "net/smc: fix socket refcount leak in smc_switch_conns()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/smc/smc_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8cb289eb764ff18000a33ddbc287d676d8597eea", "status": "affected", "version": "99f19566b1c4d3dc4d934ee2ef43faadebb56d70", "versionType": "git"}, {"lessThan": "a3378466704e0bbe93aef9769552dca7673a7eb6", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "e20227019d9da73f8fdf16f0951c2e188c84933f", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "09d7a9e162ee1a269878c126aee3d7eff43e4130", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "84dea0585f6b538ae895a8b1d025f4897737f3b1", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "d9a879ac25958bdaecb669ce70e58f8e2ff170de", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"lessThan": "719296c4aa8213d4ac8002e77d5956d436bc98d0", "status": "affected", "version": "95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a", "versionType": "git"}, {"status": "affected", "version": "0d9ddf515cde793841f738490037560fd6559c63", "versionType": "git"}, {"lessThan": "5.10.273", "status": "affected", "version": "5.10.90", "versionType": "semver"}, {"lessThan": "5.15", "status": "affected", "version": "5.14.14", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/smc/smc_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-80983", "lastModified": "2026-10-30T13:20:14.877", "metrics": {}, "published": "2026-09-11T20:19:04.787", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/09d7a9e162ee1a269878c126aee3d7eff43e4130"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/719296c4aa8213d4ac8002e77d5956d436bc98d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/84dea0585f6b538ae895a8b1d025f4897737f3b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8cb289eb764ff18000a33ddbc287d676d8597eea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3378466704e0bbe93aef9769552dca7673a7eb6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d9a879ac25958bdaecb669ce70e58f8e2ff170de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e20227019d9da73f8fdf16f0951c2e188c84933f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: net/smc socket reference leak leads to Denial of Service", "id": "2532201", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532201"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["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."], "name": "CVE-2026-80983", "public_date": "2026-09-11T19:42:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80983\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80983\nhttps://git.kernel.org/stable/c/719296c4aa8213d4ac8002e77d5956d436bc98d0\nhttps://git.kernel.org/stable/c/84dea0585f6b538ae895a8b1d025f4897737f3b1\nhttps://git.kernel.org/stable/c/d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d\nhttps://git.kernel.org/stable/c/d9a879ac25958bdaecb669ce70e58f8e2ff170de"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a,84dea0585f6b538ae895a8b1d025f4897737f3b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a,d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a,d9a879ac25958bdaecb669ce70e58f8e2ff170de)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a,719296c4aa8213d4ac8002e77d5956d436bc98d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "99f19566b1c4d3dc4d934ee2ef43faadebb56d70"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "0d9ddf515cde793841f738490037560fd6559c63"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.90,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.14.14,5.15)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T02:30:06.165515+00:00", "updated": "2026-09-21T02:30:08.194073+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}