CVE-2025-22003 (GCVE-0-2025-22003)

Vulnerability from cvelistv5 – Published: 2025-04-03 07:19 – Updated: 2025-10-01 17:09
VLAI?
Title
can: ucan: fix out of bound read in strscpy() source
Summary
In the Linux kernel, the following vulnerability has been resolved: can: ucan: fix out of bound read in strscpy() source Commit 7fdaf8966aae ("can: ucan: use strscpy() to instead of strncpy()") unintentionally introduced a one byte out of bound read on strscpy()'s source argument (which is kind of ironic knowing that strscpy() is meant to be a more secure alternative :)). Let's consider below buffers: dest[len + 1]; /* will be NUL terminated */ src[len]; /* may not be NUL terminated */ When doing: strncpy(dest, src, len); dest[len] = '\0'; strncpy() will read up to len bytes from src. On the other hand: strscpy(dest, src, len + 1); will read up to len + 1 bytes from src, that is to say, an out of bound read of one byte will occur on src if it is not NUL terminated. Note that the src[len] byte is never copied, but strscpy() still needs to read it to check whether a truncation occurred or not. This exact pattern happened in ucan. The root cause is that the source is not NUL terminated. Instead of doing a copy in a local buffer, directly NUL terminate it as soon as usb_control_msg() returns. With this, the local firmware_str[] variable can be removed. On top of this do a couple refactors: - ucan_ctl_payload->raw is only used for the firmware string, so rename it to ucan_ctl_payload->fw_str and change its type from u8 to char. - ucan_device_request_in() is only used to retrieve the firmware string, so rename it to ucan_get_fw_str() and refactor it to make it directly handle all the string termination logic.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7fdaf8966aae476deafe11f9a0067ff588615444 , < cc29775a8a72d7f3b56cc026796ad99bd65804a7 (git)
Affected: 7fdaf8966aae476deafe11f9a0067ff588615444 , < 8cec9e314d3360fc1d8346297c41a6ee45cb45a9 (git)
Affected: 7fdaf8966aae476deafe11f9a0067ff588615444 , < a4994161a61bc8fd71d105c579d847cefee99262 (git)
Affected: 7fdaf8966aae476deafe11f9a0067ff588615444 , < 1d22a122ffb116c3cf78053e812b8b21f8852ee9 (git)
Create a notification for this product.
    Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.85 , ≤ 6.6.* (semver)
Unaffected: 6.12.21 , ≤ 6.12.* (semver)
Unaffected: 6.13.9 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-22003",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T17:09:56.626610Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T17:09:59.255Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/usb/ucan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cc29775a8a72d7f3b56cc026796ad99bd65804a7",
              "status": "affected",
              "version": "7fdaf8966aae476deafe11f9a0067ff588615444",
              "versionType": "git"
            },
            {
              "lessThan": "8cec9e314d3360fc1d8346297c41a6ee45cb45a9",
              "status": "affected",
              "version": "7fdaf8966aae476deafe11f9a0067ff588615444",
              "versionType": "git"
            },
            {
              "lessThan": "a4994161a61bc8fd71d105c579d847cefee99262",
              "status": "affected",
              "version": "7fdaf8966aae476deafe11f9a0067ff588615444",
              "versionType": "git"
            },
            {
              "lessThan": "1d22a122ffb116c3cf78053e812b8b21f8852ee9",
              "status": "affected",
              "version": "7fdaf8966aae476deafe11f9a0067ff588615444",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/usb/ucan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.85",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.85",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.21",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.9",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: ucan: fix out of bound read in strscpy() source\n\nCommit 7fdaf8966aae (\"can: ucan: use strscpy() to instead of strncpy()\")\nunintentionally introduced a one byte out of bound read on strscpy()\u0027s\nsource argument (which is kind of ironic knowing that strscpy() is meant\nto be a more secure alternative :)).\n\nLet\u0027s consider below buffers:\n\n  dest[len + 1]; /* will be NUL terminated */\n  src[len]; /* may not be NUL terminated */\n\nWhen doing:\n\n  strncpy(dest, src, len);\n  dest[len] = \u0027\\0\u0027;\n\nstrncpy() will read up to len bytes from src.\n\nOn the other hand:\n\n  strscpy(dest, src, len + 1);\n\nwill read up to len + 1 bytes from src, that is to say, an out of bound\nread of one byte will occur on src if it is not NUL terminated. Note\nthat the src[len] byte is never copied, but strscpy() still needs to\nread it to check whether a truncation occurred or not.\n\nThis exact pattern happened in ucan.\n\nThe root cause is that the source is not NUL terminated. Instead of\ndoing a copy in a local buffer, directly NUL terminate it as soon as\nusb_control_msg() returns. With this, the local firmware_str[] variable\ncan be removed.\n\nOn top of this do a couple refactors:\n\n  - ucan_ctl_payload-\u003eraw is only used for the firmware string, so\n    rename it to ucan_ctl_payload-\u003efw_str and change its type from u8 to\n    char.\n\n  - ucan_device_request_in() is only used to retrieve the firmware\n    string, so rename it to ucan_get_fw_str() and refactor it to make it\n    directly handle all the string termination logic."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:27:14.151Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cc29775a8a72d7f3b56cc026796ad99bd65804a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8cec9e314d3360fc1d8346297c41a6ee45cb45a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4994161a61bc8fd71d105c579d847cefee99262"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d22a122ffb116c3cf78053e812b8b21f8852ee9"
        }
      ],
      "title": "can: ucan: fix out of bound read in strscpy() source",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22003",
    "datePublished": "2025-04-03T07:19:05.403Z",
    "dateReserved": "2024-12-29T08:45:45.802Z",
    "dateUpdated": "2025-10-01T17:09:59.255Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-22003\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T17:09:56.626610Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:39:31.660Z\"}}], \"cna\": {\"title\": \"can: ucan: fix out of bound read in strscpy() source\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7fdaf8966aae476deafe11f9a0067ff588615444\", \"lessThan\": \"cc29775a8a72d7f3b56cc026796ad99bd65804a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7fdaf8966aae476deafe11f9a0067ff588615444\", \"lessThan\": \"8cec9e314d3360fc1d8346297c41a6ee45cb45a9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7fdaf8966aae476deafe11f9a0067ff588615444\", \"lessThan\": \"a4994161a61bc8fd71d105c579d847cefee99262\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7fdaf8966aae476deafe11f9a0067ff588615444\", \"lessThan\": \"1d22a122ffb116c3cf78053e812b8b21f8852ee9\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/can/usb/ucan.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/can/usb/ucan.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cc29775a8a72d7f3b56cc026796ad99bd65804a7\"}, {\"url\": \"https://git.kernel.org/stable/c/8cec9e314d3360fc1d8346297c41a6ee45cb45a9\"}, {\"url\": \"https://git.kernel.org/stable/c/a4994161a61bc8fd71d105c579d847cefee99262\"}, {\"url\": \"https://git.kernel.org/stable/c/1d22a122ffb116c3cf78053e812b8b21f8852ee9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncan: ucan: fix out of bound read in strscpy() source\\n\\nCommit 7fdaf8966aae (\\\"can: ucan: use strscpy() to instead of strncpy()\\\")\\nunintentionally introduced a one byte out of bound read on strscpy()\u0027s\\nsource argument (which is kind of ironic knowing that strscpy() is meant\\nto be a more secure alternative :)).\\n\\nLet\u0027s consider below buffers:\\n\\n  dest[len + 1]; /* will be NUL terminated */\\n  src[len]; /* may not be NUL terminated */\\n\\nWhen doing:\\n\\n  strncpy(dest, src, len);\\n  dest[len] = \u0027\\\\0\u0027;\\n\\nstrncpy() will read up to len bytes from src.\\n\\nOn the other hand:\\n\\n  strscpy(dest, src, len + 1);\\n\\nwill read up to len + 1 bytes from src, that is to say, an out of bound\\nread of one byte will occur on src if it is not NUL terminated. Note\\nthat the src[len] byte is never copied, but strscpy() still needs to\\nread it to check whether a truncation occurred or not.\\n\\nThis exact pattern happened in ucan.\\n\\nThe root cause is that the source is not NUL terminated. Instead of\\ndoing a copy in a local buffer, directly NUL terminate it as soon as\\nusb_control_msg() returns. With this, the local firmware_str[] variable\\ncan be removed.\\n\\nOn top of this do a couple refactors:\\n\\n  - ucan_ctl_payload-\u003eraw is only used for the firmware string, so\\n    rename it to ucan_ctl_payload-\u003efw_str and change its type from u8 to\\n    char.\\n\\n  - ucan_device_request_in() is only used to retrieve the firmware\\n    string, so rename it to ucan_get_fw_str() and refactor it to make it\\n    directly handle all the string termination logic.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.85\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.21\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.9\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"6.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:27:14.151Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-22003\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T17:09:59.255Z\", \"dateReserved\": \"2024-12-29T08:45:45.802Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-03T07:19:05.403Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.