{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31705",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31705"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment\n\nsmb2_get_ea() applies 4-byte alignment padding via memset() after\nwriting each EA entry. The bounds check on buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check on remaining space.\n\nWhen the EA value exactly fills the remaining buffer (buf_free_len == 0\nafter value subtraction), the alignment memset writes 1-3 NUL bytes\npast the buf_free_len boundary. In compound requests where the response\nbuffer is shared across commands, the first command (e.g., READ) can\nconsume most of the buffer, leaving a tight remainder for the QUERY_INFO\nEA response. The alignment memset then overwrites past the physical\nkvmalloc allocation into adjacent kernel heap memory.\n\nAdd a bounds check before the alignment memset to ensure buf_free_len\ncan accommodate the padding bytes.\n\nThis is the same bug pattern fixed by commit beef2634f81f (\"ksmbd: fix\npotencial OOB in get_file_all_info() for compound requests\") and\ncommit fda9522ed6af (\"ksmbd: fix OOB write in QUERY_INFO for compound\nrequests\"), both of which added bounds checks before unconditional\nwrites in QUERY_INFO response handlers.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31705"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ddbbc8b2a09dd2cfed90871313e3691ae1db08a2"
    },
    {
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      "url": "https://git.kernel.org/stable/c/ffbce350c6fd1e99116ea57383b9031717e36d3b"
    },
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      "url": "https://git.kernel.org/stable/c/98f3de6ef4efbd899348d333f0902dc4ff14380c"
    },
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      "url": "https://git.kernel.org/stable/c/790304c02bf9bd7b8171feda4294d6e62d32ae8f"
    },
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      "url": "https://git.kernel.org/stable/c/922d48fe8c19f388ffa2f709f33acaae4e408de2"
    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ksmbd processes SMB2 requests over TCP, typically port 445, and the vulnerable `SMB2_QUERY_INFO` EA path is reachable through network packets from a remote SMB client.\nAC:L - The attacker can craft the compound response-buffer exhaustion and EA length/alignment conditions through SMB requests and controlled xattr sizes; there is no race or external condition beyond attacker control.\nPR:N - Although `SMB2_QUERY_INFO` is after session and tree setup, ksmbd supports guest/anonymous sessions and guest-accessible shares, so a reasonable deployment can expose this path without authenticated credentials.\nUI:N - No victim action is required after the server is running and exposing the share; the attacker sends SMB requests directly.\nS:U - The corruption occurs inside the kernel SMB server and impacts the same kernel/host security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:H - This is kernel heap memory corruption from an out-of-bounds write; in the highest defensible case it can be leveraged toward kernel code execution or primitives that expose arbitrary kernel data.\nI:H - The bug is an out-of-bounds write of attacker-reached data into adjacent kernel heap memory, which is high integrity impact under the kernel scoring guidance.\nA:H - The out-of-bounds heap write can corrupt kernel memory and crash or panic the system, and it can be triggered remotely and repeatedly through SMB."
    }
  }
}