FKIE_CVE-2026-15449
Vulnerability from fkie_nvd - Published: 2026-07-16 20:16 - Updated: 2026-07-17 13:17
Severity
Summary
A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in usr/src/uts/common/io/dld/dld_drv.c copies the dld_ioc_macprop_t ioctl header in once to read its pr_valsize field, sizes and allocates a kernel heap buffer from that value, and then copies the full request in a second time from the same unprivileged user address. A concurrent thread can enlarge pr_valsize between the two copyins, so the second copyin and the subsequent property handling write beyond the end of the undersized allocation and corrupt the kernel heap. An unprivileged local user, including one confined to a non-global zone that owns a datalink, can trigger this to panic the system. The resulting kernel heap corruption may be usable for further compromise.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "affected",
"modules": [
"kernel",
"dld"
],
"product": "illumos-gate",
"programFiles": [
"usr/src/uts/common/io/dld/dld_drv.c",
"usr/src/uts/common/sys/dld.h"
],
"repo": "https://github.com/illumos/illumos-gate",
"vendor": "illumos",
"versions": [
{
"changes": [
{
"at": "6959feb5b430411a4809b06c53dcdb42fb525eac",
"status": "unaffected"
}
],
"lessThan": "6959feb5b430411a4809b06c53dcdb42fb525eac",
"status": "affected",
"version": "eae72b5b807baa9116e64502cbb278edf15f3146",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "OmniOS",
"vendor": "OmniOS",
"versions": [
{
"lessThan": "r151054",
"status": "affected",
"version": "any",
"versionType": "custom"
},
{
"changes": [
{
"at": "r151058j",
"status": "unaffected"
}
],
"lessThan": "r151058j",
"status": "affected",
"version": "r151058",
"versionType": "custom"
},
{
"changes": [
{
"at": "r151056aj",
"status": "unaffected"
}
],
"lessThan": "r151056aj",
"status": "affected",
"version": "r151056",
"versionType": "custom"
},
{
"changes": [
{
"at": "r151054bj",
"status": "unaffected"
}
],
"lessThan": "r151054bj",
"status": "affected",
"version": "r151054",
"versionType": "custom"
}
]
},
{
"defaultStatus": "affected",
"product": "SmartOS",
"vendor": "Triton Data Center",
"versions": [
{
"changes": [
{
"at": "20260709",
"status": "unaffected"
}
],
"lessThan": "202060709",
"status": "affected",
"version": "any",
"versionType": "custom"
}
]
}
],
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A time-of-check to time-of-use (TOCTOU) flaw in the illumos data-link pseudo-driver (dld) affects handling of the DLDIOC_GETMACPROP and DLDIOC_SETMACPROP ioctls on /dev/dld. drv_ioc_prop_common() in usr/src/uts/common/io/dld/dld_drv.c copies the dld_ioc_macprop_t ioctl header in once to read its pr_valsize field, sizes and allocates a kernel heap buffer from that value, and then copies the full request in a second time from the same unprivileged user address. A concurrent thread can enlarge pr_valsize between the two copyins, so the second copyin and the subsequent property handling write beyond the end of the undersized allocation and corrupt the kernel heap. An unprivileged local user, including one confined to a non-global zone that owns a datalink, can trigger this to panic the system. The resulting kernel heap corruption may be usable for further compromise."
}
],
"id": "CVE-2026-15449",
"lastModified": "2026-07-17T13:17:57.710",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 5.8,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-15449",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T12:42:46.397037Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-16T20:16:44.373",
"references": [
{
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"url": "https://github.com/illumos/illumos-gate/commit/6959feb5b430411a4809b06c53dcdb42fb525eac"
},
{
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"url": "https://illumos.org/issues/18020"
},
{
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"url": "https://illumos.topicbox.com/groups/developer/T923147fae854a738-M03c29e1be33dac2a5e3d9535/18020-double-copyin-of-dldioc-consumers"
}
],
"sourceIdentifier": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
},
{
"lang": "en",
"value": "CWE-367"
}
],
"source": "0ca53633-f0b5-4853-ba72-e0a2e62000d0",
"type": "Secondary"
}
]
}
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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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