CVE-2026-49430
Full vulnerability record from the local CVENow database.
Description
The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation. A local user with the "receive" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-19 06:17:42.767000
Last modified
2026-11-09 20:10:00.200000
View original CVE JSON
{
"id": "CVE-2026-49430",
"sourceIdentifier": "[email protected]",
"published": "2026-08-19T06:17:42.767",
"lastModified": "2026-11-09T20:10:00.200",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.\n\nA local user with the \"receive\" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode."
},
{
"lang": "es",
"value": "El ioctl ZFS_IOC_RECV_NEW, en la ruta de recepción de recuperación, truncó de manera similar un tamaño de carga útil de 64 bits a un entero de 32 bits para la asignación, y luego usó el tamaño original de 64 bits como la longitud para una operación de intercambio de bytes.\n\nUn usuario local con el permiso ZFS delegado ’receive’ puede desencadenar corrupción de memoria del kernel a través de ZFS_IOC_RECV_NEW enviando un flujo de recepción manipulado en modo de recuperación."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "FreeBSD",
"product": "FreeBSD",
"defaultStatus": "unknown",
"modules": [
"zfs"
],
"versions": [
{
"version": "15.1-RELEASE",
"lessThan": "p1",
"versionType": "release",
"status": "affected"
},
{
"version": "15.0-RELEASE",
"lessThan": "p11",
"versionType": "release",
"status": "affected"
},
{
"version": "14.4-RELEASE",
"lessThan": "p7",
"versionType": "release",
"status": "affected"
},
{
"version": "14.3-RELEASE",
"lessThan": "p16",
"versionType": "release",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-26T17:41:34.004036Z",
"id": "CVE-2026-49430",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-122"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*",
"matchCriteriaId": "9DC7C54E-58AF-4ADE-84AF-0EF0F325E20E"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*",
"matchCriteriaId": "D3D22B8C-36CF-4800-9673-0B0240558BDD"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*",
"matchCriteriaId": "7296F5AA-F8C1-4277-A4EE-C2B24073A320"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*",
"matchCriteriaId": "C30E4A9C-0594-4F40-92B3-26CB9AA85AE9"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*",
"matchCriteriaId": "9F83F91B-587A-433C-99DB-0D63E267FF16"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*",
"matchCriteriaId": "44B9C2FC-756E-459F-8E68-C2C2B8C258AC"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*",
"matchCriteriaId": "A11526CF-505E-47DF-8388-65CB216D2022"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p15:*:*:*:*:*:*",
"matchCriteriaId": "632175D0-5327-4458-8968-8FA39D00F236"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*",
"matchCriteriaId": "242FA2A8-5D7D-4617-A411-2651FF3A3E4C"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*",
"matchCriteriaId": "40573F60-F3B7-4AEC-846A-B08E5B7D9D00"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*",
"matchCriteriaId": "1FB832CE-0A98-44A2-8BAC-CD38A64279B6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*",
"matchCriteriaId": "9A785F8E-C218-41AE-8D57-BF06DDAEF7CB"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*",
"matchCriteriaId": "C3909FDD-B2A2-45B6-A40B-1D303A717F15"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*",
"matchCriteriaId": "720597A2-F181-46E1-8A0D-097E17ADC4FB"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*",
"matchCriteriaId": "DC8A75D0-148A-427A-9783-45477EABED21"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*",
"matchCriteriaId": "F5D39FC9-6DBA-46C8-BB80-A6188E6A8527"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*",
"matchCriteriaId": "8F3856BE-666F-4FA1-A6AD-FE179CEBF1E4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*",
"matchCriteriaId": "D9CC0037-3282-42C3-80D8-F6C1D43B9332"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*",
"matchCriteriaId": "1EADA828-3C20-43C0-A0CA-3AC7D7F23DBD"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*",
"matchCriteriaId": "53D73FD2-4B06-47D3-BA2A-4363E9DE3565"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*",
"matchCriteriaId": "D726890B-E679-43A9-A211-D5C05BBE3941"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*",
"matchCriteriaId": "CBE94635-5277-4050-8098-F062091F6596"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p6:*:*:*:*:*:*",
"matchCriteriaId": "A66308E4-DA6E-48DB-86E5-A503EE110EAD"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*",
"matchCriteriaId": "0342A715-E211-4AF6-97ED-32EB9EBB947D"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*",
"matchCriteriaId": "368CFE5D-C5C2-42AF-AAF4-28DFE1A59C3B"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*",
"matchCriteriaId": "AA4AAA57-70A7-4717-ACF2-A253E757FF2C"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:*",
"matchCriteriaId": "683CEB32-A634-4363-86FB-2BDC59724E3E"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*",
"matchCriteriaId": "E24ABFA6-4D12-4DE5-832B-438502C7D188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*",
"matchCriteriaId": "C1C9869C-494B-4628-9AA3-4AA5B989C377"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*",
"matchCriteriaId": "002AA2FE-C7BA-471A-9434-0E56A878ACBF"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*",
"matchCriteriaId": "B187670D-E3A2-4A0D-A653-982F8B447E78"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*",
"matchCriteriaId": "047E7EE9-FB51-4CF2-A8BE-484BFD819565"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*",
"matchCriteriaId": "2C9768AE-9954-4B2A-9525-D7D4942406E7"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*",
"matchCriteriaId": "F8B9EF55-3755-452A-B067-043803099B22"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*",
"matchCriteriaId": "EE3C4F40-A117-4B37-8CDD-096A1A763630"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*",
"matchCriteriaId": "BD327D43-A2DC-49B5-A578-D2116E1E12F3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*",
"matchCriteriaId": "BF16D01F-95EC-4FE3-B32D-135CB82E8391"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:freebsd:freebsd:15.1:rc3-p1:*:*:*:*:*:*",
"matchCriteriaId": "75973F7C-645A-438C-A03B-C77AAAD20C15"
}
]
}
]
}
],
"references": [
{
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
}
]
}