{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80707",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80707"
  ],
  "published": "2026-08-28T06:53:24Z",
  "summary": "can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: transport: j1939_session_fresh_new(): initialize receive buffer\n\nZero the allocated buffer in j1939_session_fresh_new() to ensure it\ncontains no residual data.\n\nWhile there is a potential performance impact if users allocate maximum\nsized ETP buffers, most real-world use cases are not noticeably affected\nsince the maximum known buffer size is typically around 65K.\n\n[mkl: add Message-ID]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
    }
  ],
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            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80707"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/348818277a3646d5b9fa60c9d20c00dc4bc86832"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f3e120a34b336079479fa10f706f0636eaa6e751"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbfa49d1e287de44994955b44d19281be3195b44"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/194d67e92197eb820f4c2c6605d9721333b3eba0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/038bad8e16c2e28acf31f0b527a816fb23a57269"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8604a3b81b9d0ceaf04fee5f52e701f623a179f9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - Received J1939 TP/ETP RTS frames enter j1939_can_recv()\u2192j1939_tp_recv()\u2192j1939_xtp_rx_rts_session_new()\u2192j1939_session_fresh_new() from the CAN receive path with no local syscall; telematics/CAN gateways routinely expose J1939 to remote peers, consistent with prior kernel CNA scores for the same subsystem (e.g. CVE-2023-52887, CVE-2026-22997).\nAC:L - The attacker controls RTS-declared message size, DATA/EOMA sequencing, and timing; skb_put() leaves the entire allocation uninitialized, j1939_xtp_rx_eoma_one() completes without verifying all data packets arrived, and recvmsg returns the full skb length\u2014reliably mixing attacker data with residual heap bytes (including trailing padding).\nPR:N - J1939 receive processing has no authentication gate; an unauthenticated CAN/J1939 peer can send crafted transport-control frames to a victim ECU that already runs a bound J1939 socket (normal automotive, trucking, and industrial deployments) without any Linux account or capability on the target.\nUI:N - No victim interaction is required beyond the target already operating the J1939 stack with a bound socket; the attacker only transmits crafted frames on the bus to trigger session allocation and completion.\nS:U - Uninitialized kernel heap contents are disclosed to matching local J1939 socket owners via recvmsg; impact remains within the same kernel security authority and does not cross VM, IOMMU, or sandbox boundaries.\nC:H - j1939_session_fresh_new() allocates the receive buffer with skb_put() instead of skb_put_zero(), so unfilled bytes retain prior slab contents; on completion j1939_session_completed() delivers the full total_message_size buffer (up to tp_max_packet_size, commonly ~65K) to userspace, disclosing kernel pointers and heap data.\nI:N - The bug only omits zero-initialization of the receive skb; there is no out-of-bounds write, use-after-free, or other memory-corruption primitive enabling integrity impact.\nA:N - Sessions complete or abort normally without kernel panic, oops, hang, or resource exhaustion; the vulnerability is an information-disclosure defect with no availability impact."
    }
  }
}