CVE-2026-80983 (GCVE-0-2026-80983)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-10-30 12:31
VLAI
EPSS
VEX
Title
net/smc: fix socket refcount leak in smc_switch_conns()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix socket refcount leak in smc_switch_conns()
smc_switch_conns() takes a reference on the SMC socket before dropping
lgr->conns_lock, so the connection stays alive while the CDC slot is
fetched:
sock_hold(&smc->sk);
read_unlock_bh(&lgr->conns_lock);
/* pre-fetch buffer outside of send_lock, might sleep */
rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
if (rc)
goto err_out;
The err_out label only drops the wr_tx link reference, so this early exit
returns without the matching sock_put(). The second error exit is not
affected, because sock_put() has already run by then.
A leaked sk_refcnt means the smc_sock is never destroyed. Its send and
receive buffers stay allocated, and for a user socket the reference held
on the network namespace is never released, so the netns can no longer be
torn down.
smc_cdc_get_free_slot() fails when the target link goes down or when the
connection has been killed while the switch is in progress. Both are
reachable during the link failover this function implements, so the leak
is triggered by the same hardware events that make smc_switch_conns() run
in the first place.
Restructure so there is a single sock_put() covering both outcomes,
instead of adding a second one to the error path.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
99f19566b1c4d3dc4d934ee2ef43faadebb56d70 , < 8cb289eb764ff18000a33ddbc287d676d8597eea
(git)
Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < a3378466704e0bbe93aef9769552dca7673a7eb6 (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < e20227019d9da73f8fdf16f0951c2e188c84933f (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < 09d7a9e162ee1a269878c126aee3d7eff43e4130 (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < 84dea0585f6b538ae895a8b1d025f4897737f3b1 (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < d9a879ac25958bdaecb669ce70e58f8e2ff170de (git) Affected: 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a , < 719296c4aa8213d4ac8002e77d5956d436bc98d0 (git) Affected: 0d9ddf515cde793841f738490037560fd6559c63 (git) Affected: 5.10.90 , < 5.10.273 (semver) Affected: 5.14.14 , < 5.15 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 5.10.273 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"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": [
{
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"version": "99f19566b1c4d3dc4d934ee2ef43faadebb56d70",
"versionType": "git"
},
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"versionType": "git"
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"version": "0d9ddf515cde793841f738490037560fd6559c63",
"versionType": "git"
},
{
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"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.273",
"versionStartIncluding": "5.10.90",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.14.14",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003econns_lock, so the connection stays alive while the CDC slot is\nfetched:\n\n sock_hold(\u0026smc-\u003esk);\n read_unlock_bh(\u0026lgr-\u003econns_lock);\n /* pre-fetch buffer outside of send_lock, might sleep */\n rc = smc_cdc_get_free_slot(conn, to_lnk, \u0026wr_buf, NULL, \u0026pend);\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."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:31:34.279Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80983",
"datePublished": "2026-09-11T19:42:42.912Z",
"dateReserved": "2026-08-26T14:34:25.811Z",
"dateUpdated": "2026-10-30T12:31:34.279Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-80983",
"date": "2026-11-01",
"epss": "0.00177",
"percentile": "0.07191"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T02:10:09.000Z",
"cve": "CVE-2026-80983",
"id": "msrc_CVE-2026-80983",
"initial_release_date": "2026-09-13T01:11:11.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "net/smc: fix socket refcount leak in smc_switch_conns()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80983.json",
"version": "5"
},
"nvd": {
"cve": {
"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-\u003econns_lock, so the connection stays alive while the CDC slot is\nfetched:\n\n sock_hold(\u0026smc-\u003esk);\n read_unlock_bh(\u0026lgr-\u003econns_lock);\n /* pre-fetch buffer outside of send_lock, might sleep */\n rc = smc_cdc_get_free_slot(conn, to_lnk, \u0026wr_buf, NULL, \u0026pend);\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"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-10-17T21:46:09+00:00",
"cve": "CVE-2026-80983",
"id": "CVE-2026-80983",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_affected": "235",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/smc: fix socket refcount leak in smc_switch_conns()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80983.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.