{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64578",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64578"
  ],
  "published": "2026-08-05T08:09:29Z",
  "summary": "ksmbd: validate compound request size before reading StructureSize2",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate compound request size before reading StructureSize2\n\nWhen ksmbd validates a compound (chained) SMB2 request,\nksmbd_smb2_check_message() reads pdu->StructureSize2 without first\nchecking that the compound element is large enough to contain it.\nStructureSize2 is a 2-byte field at offset 64\n(__SMB2_HEADER_STRUCTURE_SIZE) from the start of each element.\n\nThe compound-walking logic only guarantees that a full 64-byte SMB2\nheader is present for the trailing element: when NextCommand is 0, len is\nreduced to the number of bytes remaining after next_smb2_rcv_hdr_off. A\nremote client can craft a compound request whose last element has exactly\n64 bytes, so the 2-byte StructureSize2 read at offset 64 extends one byte\npast the receive buffer, producing a slab-out-of-bounds read.\n\n  BUG: KASAN: slab-out-of-bounds in ksmbd_smb2_check_message (fs/smb/server/smb2misc.c:402)\n  Read of size 2 at addr ffff888012ae31ac by task kworker/0:1/14\n  The buggy address is located 172 bytes inside of allocated 173-byte region\n  Workqueue: ksmbd-io handle_ksmbd_work\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   ksmbd_smb2_check_message (fs/smb/server/smb2misc.c:402)\n   handle_ksmbd_work (fs/smb/server/server.c:119)\n   process_one_work (kernel/workqueue.c:3314)\n   worker_thread (kernel/workqueue.c:3397)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n\nReject any compound element that is too small to hold StructureSize2\nbefore dereferencing it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64578"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/415d0fff0451ad7ad4caa910f2bb0f562f0fd60f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b6740525f5af90868d557c31b496ae689c8c549"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c307126ed8e7adddab82b8e31d962d3a2156ab1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f7550a91ab211726f59cb137523b7a9eae1ac6eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0e337e7db67cc1c832958bbb6c4026bdceacfdb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea128f06d2fb2186f0cac0c9f3e953e4d1f5c29a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15b38176fd1530372905c602fde51fe89ec8c877"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is an in-kernel SMB server reached over TCP/445; a remote client triggers the bug by sending a crafted compound SMB2 request that is processed in handle_ksmbd_work() \u2192 ksmbd_verify_smb_message() \u2192 ksmbd_smb2_check_message().\nAC:L - The attacker fully controls compound layout and can set the trailing element's remaining length to exactly 64 bytes so StructureSize2 is read one byte past the receive buffer; no race or attacker-uncontrollable condition is required.\nPR:N - On affected kernels before the compound SESSION_VALID check, a compound NtLmNegotiate SESSION_SETUP (pre-auth, no credentials) sets work->sess and the trailing element still reaches ksmbd_smb2_check_message(); guest/anonymous SESSION_SETUP likewise needs no host privileges.\nUI:N - Exploitation requires only attacker-sent SMB2 protocol traffic to a listening ksmbd service; no victim user action is needed.\nS:U - The out-of-bounds read and any resulting kernel impact occur in the host ksmbd/workqueue context and do not cross a VM, IOMMU, or other security-authority boundary.\nC:L - The flaw is a strictly bounded slab out-of-bounds read of one byte past the receive buffer (2-byte StructureSize2 at offset 64 when only 64 bytes remain); it may disclose adjacent slab contents but not an arbitrary read primitive.\nI:N - The bug only reads past the buffer for a StructureSize2 comparison; for a 64-byte trailing element every valid command size is then rejected, and there is no out-of-bounds write or other modification primitive.\nA:H - KASAN reports a slab-out-of-bounds BUG in ksmbd_smb2_check_message(), and the same access can oops/panic hardened or redzone-enabled kernels; a remote peer can retrigger it with further crafted compound requests."
    }
  }
}