CVE-2026-49430 (GCVE-0-2026-49430)

Vulnerability from cvelistv5 – Published: 2026-08-19 05:15 – Updated: 2026-08-19 05:15
VLAI
Title
Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
Summary
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
No CVSS data available.
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
FreeBSD FreeBSD Affected: 15.1-RELEASE , < p1 (release)
Affected: 15.0-RELEASE , < p11 (release)
Affected: 14.4-RELEASE , < p7 (release)
Affected: 14.3-RELEASE , < p16 (release)
guessed Create a notification for this product.
Date Public
2026-06-30 20:00
Credits
Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai Emmanuel Genier at Quarkslab
Show details on NVD website
To clipboard 

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          "type": "finder",
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        },
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      "datePublic": "2026-06-30T20:00:00.000Z",
      "descriptions": [
        {
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          "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "CWE-122: Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T05:15:29.940Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
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          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc"
        }
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      "title": "Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl",
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    "datePublished": "2026-08-19T05:15:29.940Z",
    "dateReserved": "2026-05-29T20:24:28.616Z",
    "dateUpdated": "2026-08-19T05:15:29.940Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "epss": {
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  }
}



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