CVE-2026-53274 (GCVE-0-2026-53274)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
EPSS
VEX
Title
net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
A logic flaw in __smc_setsockopt() allows a local unprivileged user to
cause a Denial of Service (DoS) by holding the socket lock indefinitely.
The function __smc_setsockopt() calls copy_from_sockptr() while holding
lock_sock(sk). By passing a userfaultfd-monitored memory page (or
FUSE-backed memory on systems where unprivileged userfaultfd is disabled)
as the optval, an attacker can halt execution during the copy operation,
keeping the lock held.
Combined with asynchronous tear-down operations like shutdown(), this
exhausts the kernel wq (kworkers) and triggers the hung task watchdog.
[ 240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.
[ 240.123489] Call Trace:
[ 240.123501] smc_shutdown+...
[ 240.123512] lock_sock_nested+...
This patch moves the user-space copy outside the lock_sock() critical
section to prevent the issue.
Severity
5.5 (Medium)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 35a22117839602bb52283de08894c5a7dde92420
(git)
Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 5d27d2ffe487df89ce28fda0410eafa05dbe03a0 (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < dcd90f42a33e4220385f27b515183d0c91b2fc4a (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 94d286fa5eedc550d42bcb9c85416af8f77736ff (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < a3fdd924d88c30b9f488636ce0e4696012cf5511 (git) |
guessed | |
| Linux | Linux |
Affected:
5.18
Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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},
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}
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}
],
"cpeApplicability": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS\n\nA logic flaw in __smc_setsockopt() allows a local unprivileged user to\ncause a Denial of Service (DoS) by holding the socket lock indefinitely.\n\nThe function __smc_setsockopt() calls copy_from_sockptr() while holding\nlock_sock(sk). By passing a userfaultfd-monitored memory page (or\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\nas the optval, an attacker can halt execution during the copy operation,\nkeeping the lock held.\n\nCombined with asynchronous tear-down operations like shutdown(), this\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\n\n[ 240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\n[ 240.123489] Call Trace:\n[ 240.123501] smc_shutdown+...\n[ 240.123512] lock_sock_nested+...\n\nThis patch moves the user-space copy outside the lock_sock() critical\nsection to prevent the issue."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-25T08:39:58.478Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420"
},
{
"url": "https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0"
},
{
"url": "https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91"
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{
"url": "https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a"
},
{
"url": "https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff"
},
{
"url": "https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511"
}
],
"title": "net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS",
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"datePublished": "2026-06-25T08:39:58.478Z",
"dateReserved": "2026-06-09T07:44:35.395Z",
"dateUpdated": "2026-06-25T08:39:58.478Z",
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"date": "2026-09-15",
"epss": "0.00172",
"percentile": "0.06879"
},
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"current_release_date": "2026-06-28T01:47:38.000Z",
"cve": "CVE-2026-53274",
"id": "msrc_CVE-2026-53274",
"initial_release_date": "2026-06-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53274.json",
"version": "2"
},
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By passing a userfaultfd-monitored memory page (or\\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\\nas the optval, an attacker can halt execution during the copy operation,\\nkeeping the lock held.\\n\\nCombined with asynchronous tear-down operations like shutdown(), this\\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\\n\\n[ 240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\\n[ 240.123489] Call Trace:\\n[ 240.123501] smc_shutdown+...\\n[ 240.123512] lock_sock_nested+...\\n\\nThis patch moves the user-space copy outside the lock_sock() critical\\nsection to prevent the issue.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"35a22117839602bb52283de08894c5a7dde92420\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"5d27d2ffe487df89ce28fda0410eafa05dbe03a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"89f6fbe0033c942cb790ffd53ca93a45eeaf1c91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"dcd90f42a33e4220385f27b515183d0c91b2fc4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"94d286fa5eedc550d42bcb9c85416af8f77736ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6a6fe27bab48f0d09a64b051e7bde432fcae081\",\"lessThan\":\"a3fdd924d88c30b9f488636ce0e4696012cf5511\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"E993847F-F6CD-4FFE-A341-8A32051D3681\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"85421C0C-ABDE-4357-971C-67F9087DE1B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.13\",\"matchCriteriaId\":\"6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"EC732D08-5F7B-46D9-B154-E60C7F4F0A97\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91\",\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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-08T04:06:01+00:00",
"cve": "CVE-2026-53274",
"id": "CVE-2026-53274",
"initial_release_date": "2026-06-25T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53274.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-10T16:55:55Z",
"cve": "CVE-2026-53274",
"id": "CVE-2026-53274",
"initial_release_date": "2026-06-26T02:07:50Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "482",
"product_status:known_not_affected": "221",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-53274",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53274.json",
"version": "15"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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