Skip to content
Heist/ feed
Back to feed
Medium

can: Local Denial of Service via SocketCAN Send

Type: advisorySources: OSV

The SocketCAN implementation validates the length of a user-provided buffer containing a socketcan_frame object using only a NET_ASSERT statement in zcan_sendto_ctx() before dereferencing it in socketcan_to_can_frame(). In production builds where assertions are disabled, a userspace application that controls the length passed to a sendto syscall can supply an incomplete or truncated frame, causing socketcan_to_can_frame() to dereference fields beyond the end of the buffer. This results in an out-of-bounds read that can cause denial-of-service crashes or, because the parsed frame contents are transmitted on the network, leak adjacent memory.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-5071
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 17:51 UTC · Revision 1

Source evidence

can: Local Denial of Service via SocketCAN Send

core-osv · Original source

Published 30 May 2026, 07:15 UTC

The SocketCAN implementation validates the length of a user-provided buffer containing a socketcan_frame object using only a NET_ASSERT statement in zcan_sendto_ctx() before dereferencing it in socketcan_to_can_frame(). In production builds where assertions are disabled, a userspace application that controls the length passed to a sendto syscall can supply an incomplete or truncated frame, causing socketcan_to_can_frame() to dereference fields beyond the end of the buffer. This results in an out-of-bounds read that can cause denial-of-service crashes or, because the parsed frame contents are transmitted on the network, leak adjacent memory.

osv:CVE-2026-5071
Complete source record
{
  "id": "4e17b020aa24fe0db1e4af0efdfb3fb3e9adfa18e6e757f960bd84b2307543c7",
  "url": "https://osv.dev/vulnerability/CVE-2026-5071",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "can: Local Denial of Service via SocketCAN Send",
    "summary": "The SocketCAN implementation validates the length of a user-provided buffer containing a socketcan_frame object using only a NET_ASSERT statement in zcan_sendto_ctx() before dereferencing it in socketcan_to_can_frame(). In production builds where assertions are disabled, a userspace application that controls the length passed to a sendto syscall can supply an incomplete or truncated frame, causing socketcan_to_can_frame() to dereference fields beyond the end of the buffer. This results in an out-of-bounds read that can cause denial-of-service crashes or, because the parsed frame contents are transmitted on the network, leak adjacent memory.",
    "evidence": "osv:CVE-2026-5071",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5071",
      "aliases": [
        "CVE-2026-5071",
        "GHSA-c3w6-x7m3-3c58"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/zephyrproject-rtos/zephyr",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bbbf8b30094dacd0d6830946ba206bcec8af6b0c"
                },
                {
                  "introduced": "8469084dfae85f854555f0607f2c838dad097235"
                },
                {
                  "fixed": "dbb536326e611dc8e97cc6a322d379ba9cac1ab7"
                },
                {
                  "introduced": "3568e1b6d5cdd51a6b964a2a1d6d29200fea2056"
                },
                {
                  "fixed": "75f67d766726351b30199f9a2bf55803d717a3be"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "*"
                      },
                      {
                        "fixed": "3.7.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.2.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "4.3.0"
                      },
                      {
                        "fixed": "4.3.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.3.1-rc1",
            "v3.7.2-rc2",
            "v4.3.0",
            "v4.2.1",
            "v4.2.0",
            "v4.2.0-rc3",
            "v4.2.0-rc2",
            "v4.2.0-rc1",
            "v4.1.0",
            "v4.1.0-rc3",
            "v4.1.0-rc2",
            "v4.1.0-rc1",
            "v3.7.1",
            "v4.0.0",
            "v3.7.1-rc1",
            "v3.7.0",
            "v3.7.0-rc3",
            "v3.7.0-rc2",
            "v3.7.0-rc1",
            "v3.6.0",
            "v3.6.0-rc3",
            "v3.6.0-rc2",
            "v3.6.0-rc1",
            "zephyr-v3.5.0",
            "v3.5.0",
            "v3.5.0-rc3",
            "v3.5.0-rc2",
            "v3.5.0-rc1",
            "zephyr-v3.4.0",
            "v3.4.0",
            "v3.4.0-rc3",
            "v3.4.0-rc2",
            "v3.4.0-rc1",
            "zephyr-v3.3.0",
            "v3.3.0",
            "v3.3.0-rc3",
            "v3.3.0-rc2",
            "v3.3.0-rc1",
            "zephyr-v3.2.0",
            "v3.2.0",
            "v3.2.0-rc3",
            "v3.2.0-rc2",
            "v3.2.0-rc1",
            "zephyr-v3.1.0",
            "v3.1.0",
            "v3.1.0-rc3",
            "v3.1.0-rc2",
            "v3.1.0-rc1",
            "zephyr-v3.0.0",
            "v3.0.0",
            "v3.0.0-rc3",
            "v3.0.0-rc2",
            "v3.0.0-rc1",
            "v2.7.99",
            "v2.7.0-rc3",
            "v2.7.0-rc2",
            "v2.7.0-rc1",
            "zephyr-v2.6.0",
            "v2.6.0",
            "v2.6.0-rc3",
            "v2.6.0-rc2",
            "v2.6.0-rc1",
            "zephyr-v2.5.0",
            "v2.5.0",
            "v2.5.0-rc4",
            "v2.5.0-rc3",
            "v2.5.0-rc2",
            "v2.5.0-rc1",
            "zephyr-v2.4.0",
            "v2.4.0",
            "v2.4.0-rc3",
            "v2.4.0-rc2",
            "v2.4.0-rc1",
            "zephyr-v2.3.0",
            "v2.3.0",
            "v2.3.0-rc2",
            "v2.3.0-rc1",
            "zephyr-v2.1.0",
            "v2.1.0",
            "zephyr-v2.2.0",
            "v2.2.0",
            "v2.2.0-rc3",
            "v2.2.0-rc2",
            "v2.2.0-rc1",
            "v2.1.0-rc3",
            "v2.1.0-rc2",
            "v2.1.0-rc1",
            "zephyr-v2.0.0",
            "v2.0.0",
            "v2.0.0-rc3",
            "v2.0.0-rc2",
            "v2.0.0-rc1",
            "zephyr-v1.14.0",
            "v1.14.0",
            "v1.14.0-rc3",
            "v1.14.0-rc2",
            "v1.14.0-rc1",
            "zephyr-v1.13.0",
            "v1.13.0",
            "v1.13.0-rc3",
            "v1.13.0-rc2",
            "v1.13.0-rc1",
            "zephyr-v1.12.0",
            "v1.12.0",
            "v1.12.0-rc3",
            "v1.12.0-rc2",
            "v1.12.0-rc1",
            "zephyr-v1.11.0",
            "v1.11.0",
            "v1.11.0-rc3",
            "v1.11.0-rc2",
            "v1.11.0-rc1",
            "zephyr-v1.10.0",
            "v1.10.0",
            "v1.10.0-rc3",
            "v1.10.0-rc2",
            "v1.10.0-rc1",
            "zephyr-v1.9.0",
            "v1.9.0",
            "v1.9.0-rc4",
            "v1.9.0-rc3",
            "v1.9.0-rc2",
            "v1.9.0-rc1",
            "v1.8.99",
            "zephyr-v1.5.0",
            "v1.5.0",
            "v1.7.99",
            "v1.6.99",
            "v1.5.0-rc4",
            "v1.5.0-rc3",
            "v1.5.0-rc2",
            "v1.5.0-rc1",
            "v1.5.0-rc0",
            "zephyr-v1.4.0",
            "v1.4.0",
            "v1.4.0-rc3",
            "v1.4.0-rc2",
            "v1.4.0-rc1",
            "zephyr-v1.3.0",
            "v1.3.0",
            "v1.3.0-rc2",
            "v1.3.0-rc1",
            "zephyr-v1.2.0",
            "v1.2.0",
            "v1.2.0-rc2",
            "v1.2.0-rc1",
            "zephyr-v1.1.0",
            "v1.1.0",
            "v1.1.0-rc1",
            "zephyr-v1.0.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5071.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.401614901Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5071.json",
        "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3w6-x7m3-3c58",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5071",
        "https://github.com/zephyrproject-rtos/zephyr"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "zephyr",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5071.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5071",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487698,
  "published_at": "2026-05-30T07:15:56.417+00:00"
}