CVE-2025-40004 (GCVE-0-2025-40004)

Vulnerability from cvelistv5 – Published: 2025-10-20 05:26 – Updated: 2025-12-01 06:16
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/9p: Fix buffer overflow in USB transport layer A buffer overflow vulnerability exists in the USB 9pfs transport layer where inconsistent size validation between packet header parsing and actual data copying allows a malicious USB host to overflow heap buffers. The issue occurs because: - usb9pfs_rx_header() validates only the declared size in packet header - usb9pfs_rx_complete() uses req->actual (actual received bytes) for memcpy This allows an attacker to craft packets with small declared size (bypassing validation) but large actual payload (triggering overflow in memcpy). Add validation in usb9pfs_rx_complete() to ensure req->actual does not exceed the buffer capacity before copying data.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a3be076dc174d9022a71a12554feb4c97b5c4d5c , < 0da18d49f874d444ad83c8a546fa33bfcf2f582c (git)
Affected: a3be076dc174d9022a71a12554feb4c97b5c4d5c , < df8462f0fc045b4475dc494a5787a03c972ba2a2 (git)
Affected: a3be076dc174d9022a71a12554feb4c97b5c4d5c , < c04db81cd0288dfc68b7a0f7d09bd49b40bba451 (git)
Create a notification for this product.
    Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/9p/trans_usbg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0da18d49f874d444ad83c8a546fa33bfcf2f582c",
              "status": "affected",
              "version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c",
              "versionType": "git"
            },
            {
              "lessThan": "df8462f0fc045b4475dc494a5787a03c972ba2a2",
              "status": "affected",
              "version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c",
              "versionType": "git"
            },
            {
              "lessThan": "c04db81cd0288dfc68b7a0f7d09bd49b40bba451",
              "status": "affected",
              "version": "a3be076dc174d9022a71a12554feb4c97b5c4d5c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/9p/trans_usbg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: Fix buffer overflow in USB transport layer\n\nA buffer overflow vulnerability exists in the USB 9pfs transport layer\nwhere inconsistent size validation between packet header parsing and\nactual data copying allows a malicious USB host to overflow heap buffers.\n\nThe issue occurs because:\n- usb9pfs_rx_header() validates only the declared size in packet header\n- usb9pfs_rx_complete() uses req-\u003eactual (actual received bytes) for\nmemcpy\n\nThis allows an attacker to craft packets with small declared size\n(bypassing validation) but large actual payload (triggering overflow\nin memcpy).\n\nAdd validation in usb9pfs_rx_complete() to ensure req-\u003eactual does not\nexceed the buffer capacity before copying data."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:16:17.602Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c"
        },
        {
          "url": "https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451"
        }
      ],
      "title": "net/9p: Fix buffer overflow in USB transport layer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40004",
    "datePublished": "2025-10-20T05:26:08.787Z",
    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2025-12-01T06:16:17.602Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40004\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-20T06:15:36.280\",\"lastModified\":\"2025-10-21T19:31:25.450\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/9p: Fix buffer overflow in USB transport layer\\n\\nA buffer overflow vulnerability exists in the USB 9pfs transport layer\\nwhere inconsistent size validation between packet header parsing and\\nactual data copying allows a malicious USB host to overflow heap buffers.\\n\\nThe issue occurs because:\\n- usb9pfs_rx_header() validates only the declared size in packet header\\n- usb9pfs_rx_complete() uses req-\u003eactual (actual received bytes) for\\nmemcpy\\n\\nThis allows an attacker to craft packets with small declared size\\n(bypassing validation) but large actual payload (triggering overflow\\nin memcpy).\\n\\nAdd validation in usb9pfs_rx_complete() to ensure req-\u003eactual does not\\nexceed the buffer capacity before copying data.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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.