{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72014",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72014"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "drbd: reject data replies with an out-of-range payload size",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: reject data replies with an out-of-range payload size\n\nrecv_dless_read() receives a P_DATA_REPLY from a peer into the bio of an\noutstanding read request. The peer-supplied payload length reaches it as\nthe signed int data_size, and two peer-controlled inputs can make it\nnegative. With a negotiated data-integrity-alg the digest length is\nsubtracted first, so a reply whose payload is smaller than the digest\nunderflows data_size. With no integrity algorithm (the default) data_size\nis assigned from the unsigned h95/h100 wire length and drbdd() never\nbounds it for a payload-carrying command, so a length above INT_MAX casts\nit negative; this path needs no non-default feature. The bio receive loop\nthen computes expect = min_t(int, data_size, bv_len), which is negative,\nand drbd_recv_all_warn(mapped, expect) receives with a size_t of SIZE_MAX\ninto the first mapped page.\n\nThe sibling receive path read_in_block() is not affected: it uses an\nunsigned size and rejects it against DRBD_MAX_BIO_SIZE before receiving.\nReject a data reply whose size is negative after the optional digest\nsubtraction, covering both triggers.\n\nImpact: a malicious or man-in-the-middle DRBD peer copies attacker-chosen\nbytes past a bio page in the receiver, corrupting kernel memory. A node\nthat reads from its peer (a diskless node, or read-balancing to the peer)\nis exposed in the default configuration; data-integrity-alg is not\nrequired.",
  "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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            "upstream_fixed": "6.18.40"
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72014"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bca33f5442c3094511719d9db792ce3165d87e76"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/741a682535deffe9ab7e5c89caf83571efbc9dd9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f14e87d7b166490bceb9603b39310e51595d05b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f16866c62656865854106b79bcf6e4ca97a51a92"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f59a8142000f0b8f75c432209ead73c424a745d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38cc4867540ae8beedfe41a1a1a6ed37052c77d6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bd910a7660d280595ef94cb6d193951d855d330f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Exploitation is delivered over the DRBD replication TCP protocol when a victim node receives a malicious P_DATA_REPLY from its peer or a man-in-the-middle on that link; recv_dless_read() is reached from drbdd() without any local syscall or ioctl on the victim.\nAC:L - The peer fully controls the wire length in the P_DATA_REPLY header, and two independent triggers (unsigned-to-signed overflow or digest subtraction underflow) deterministically force expect negative so drbd_recv_all_warn() receives SIZE_MAX bytes whenever the victim issues a remote read.\nPR:N - No account, capability, or administrative access on the victim host is required; a malicious DRBD peer or network man-in-the-middle on the replication link can send the crafted reply after connection setup, and cram-hmac-alg peer authentication is optional.\nUI:N - No end-user action is needed because diskless-primary and read-balancing configurations automatically send P_DATA_REQUEST packets to the peer, and the malicious P_DATA_REPLY is processed in the kernel receiver thread during normal I/O.\nS:U - The out-of-bounds socket receive corrupts kernel memory on the same host that runs DRBD; successful exploitation yields kernel compromise on that node but does not by itself cross a VM, container, or IOMMU security boundary.\nC:H - Receiving up to SIZE_MAX attacker-controlled bytes past the mapped bio page is an out-of-bounds kernel write that can corrupt adjacent heap or page data and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak.\nI:H - The bug copies attacker-chosen network data beyond the allocated bio buffer boundary, providing a kernel out-of-bounds write primitive that can corrupt kernel structures and enable arbitrary code execution or privilege escalation.\nA:H - Writing gigabytes past a bio page can immediately corrupt critical kernel memory and cause oops or panic, and repeated malicious replies can keep the node unavailable even before full exploitation."
    }
  }
}