Vulnerability-Lookup

CVE-2026-64339 (GCVE-0-2026-64339)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

usb: misc: usbio: bound bulk IN response length to the received transfer

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: misc: usbio: bound bulk IN response length to the received transfer usbio_bulk_msg() copies bpkt_len = le16_to_cpu(bpkt->len) bytes out of the bulk IN buffer (usbio->rxbuf, allocated with size usbio->rxbuf_len) into the caller's buffer. bpkt_len is fully controlled by the device and is only checked against ibuf_len; ibuf_len in turn is checked against usbio->txbuf_len, not against rxbuf_len: if ((obuf_len > (usbio->txbuf_len - sizeof(*bpkt))) || (ibuf_len > (usbio->txbuf_len - sizeof(*bpkt)))) return -EMSGSIZE; txbuf_len and rxbuf_len are taken independently from the bulk OUT and bulk IN endpoint wMaxPacketSize in usbio_probe(). A malicious or malfunctioning device that advertises a large bulk OUT endpoint and a small bulk IN endpoint (e.g. by claiming one of the quirk-free IDs such as the Lattice NX33U, 0x2ac1:0x20cb) therefore makes ibuf_len, and hence the device-supplied bpkt_len, exceed rxbuf_len. memcpy() then reads up to txbuf_len - rxbuf_len bytes past the end of the rxbuf slab object. The over-read bytes are handed back to the i2c layer and on to user space through i2c-dev, disclosing adjacent slab memory; with KASAN this is reported as a slab-out-of-bounds read. The number of bytes actually received is already known: act equals the URB actual_length and is bounded by rxbuf_len. Reject any response that claims more payload than was received, mirroring the existing "act < sizeof(*bpkt)" check just above. The control path (usbio_ctrl_msg()) is not affected: it uses a single buffer (ctrlbuf) for both directions, so its analogous copy can never leave the allocation. Found by code review. The out-of-bounds read was confirmed under AddressSanitizer with a faithful userspace model of usbio_bulk_msg()'s receive path (an rxbuf_len-sized buffer, the same act/ibuf_len/bpkt_len checks and the memcpy). A USB raw-gadget + dummy_hcd reproducer is also available.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/48394f94211cf8fe0…
https://git.kernel.org/stable/c/fc1b546973c1442d5…
https://git.kernel.org/stable/c/8c6314489550fa81d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < 48394f94211cf8fe0ea8604fc441633abf90fc94 (git) Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < fc1b546973c1442d5b947fcdd03581f20ecc5bd2 (git) Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < 8c6314489550fa81d41723a0ff33f655b5b6c7b6 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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            },
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.18"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: misc: usbio: bound bulk IN response length to the received transfer\n\nusbio_bulk_msg() copies bpkt_len = le16_to_cpu(bpkt-\u003elen) bytes out of\nthe bulk IN buffer (usbio-\u003erxbuf, allocated with size usbio-\u003erxbuf_len)\ninto the caller\u0027s buffer.  bpkt_len is fully controlled by the device\nand is only checked against ibuf_len; ibuf_len in turn is checked\nagainst usbio-\u003etxbuf_len, not against rxbuf_len:\n\n\tif ((obuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))) ||\n\t    (ibuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))))\n\t\treturn -EMSGSIZE;\n\ntxbuf_len and rxbuf_len are taken independently from the bulk OUT and\nbulk IN endpoint wMaxPacketSize in usbio_probe().  A malicious or\nmalfunctioning device that advertises a large bulk OUT endpoint and a\nsmall bulk IN endpoint (e.g. by claiming one of the quirk-free IDs such\nas the Lattice NX33U, 0x2ac1:0x20cb) therefore makes ibuf_len, and\nhence the device-supplied bpkt_len, exceed rxbuf_len.  memcpy() then\nreads up to txbuf_len - rxbuf_len bytes past the end of the rxbuf slab\nobject.  The over-read bytes are handed back to the i2c layer and on to\nuser space through i2c-dev, disclosing adjacent slab memory; with KASAN\nthis is reported as a slab-out-of-bounds read.\n\nThe number of bytes actually received is already known: act equals the\nURB actual_length and is bounded by rxbuf_len.  Reject any response\nthat claims more payload than was received, mirroring the existing\n\"act \u003c sizeof(*bpkt)\" check just above.\n\nThe control path (usbio_ctrl_msg()) is not affected: it uses a single\nbuffer (ctrlbuf) for both directions, so its analogous copy can never\nleave the allocation.\n\nFound by code review.  The out-of-bounds read was confirmed under\nAddressSanitizer with a faithful userspace model of usbio_bulk_msg()\u0027s\nreceive path (an rxbuf_len-sized buffer, the same act/ibuf_len/bpkt_len\nchecks and the memcpy).  A USB raw-gadget + dummy_hcd reproducer is\nalso available."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:03.272Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/48394f94211cf8fe0ea8604fc441633abf90fc94"
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          "url": "https://git.kernel.org/stable/c/fc1b546973c1442d5b947fcdd03581f20ecc5bd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c6314489550fa81d41723a0ff33f655b5b6c7b6"
        }
      ],
      "title": "usb: misc: usbio: bound bulk IN response length to the received transfer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64339",
    "datePublished": "2026-07-25T08:50:03.272Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-07-25T08:50:03.272Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64339",
      "date": "2026-07-26",
      "epss": "0.00198",
      "percentile": "0.09856"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64339\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:15.870\",\"lastModified\":\"2026-07-25T10:17:15.870\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: misc: usbio: bound bulk IN response length to the received transfer\\n\\nusbio_bulk_msg() copies bpkt_len = le16_to_cpu(bpkt-\u003elen) bytes out of\\nthe bulk IN buffer (usbio-\u003erxbuf, allocated with size usbio-\u003erxbuf_len)\\ninto the caller\u0027s buffer.  bpkt_len is fully controlled by the device\\nand is only checked against ibuf_len; ibuf_len in turn is checked\\nagainst usbio-\u003etxbuf_len, not against rxbuf_len:\\n\\n\\tif ((obuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))) ||\\n\\t    (ibuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))))\\n\\t\\treturn -EMSGSIZE;\\n\\ntxbuf_len and rxbuf_len are taken independently from the bulk OUT and\\nbulk IN endpoint wMaxPacketSize in usbio_probe().  A malicious or\\nmalfunctioning device that advertises a large bulk OUT endpoint and a\\nsmall bulk IN endpoint (e.g. by claiming one of the quirk-free IDs such\\nas the Lattice NX33U, 0x2ac1:0x20cb) therefore makes ibuf_len, and\\nhence the device-supplied bpkt_len, exceed rxbuf_len.  memcpy() then\\nreads up to txbuf_len - rxbuf_len bytes past the end of the rxbuf slab\\nobject.  The over-read bytes are handed back to the i2c layer and on to\\nuser space through i2c-dev, disclosing adjacent slab memory; with KASAN\\nthis is reported as a slab-out-of-bounds read.\\n\\nThe number of bytes actually received is already known: act equals the\\nURB actual_length and is bounded by rxbuf_len.  Reject any response\\nthat claims more payload than was received, mirroring the existing\\n\\\"act \u003c sizeof(*bpkt)\\\" check just above.\\n\\nThe control path (usbio_ctrl_msg()) is not affected: it uses a single\\nbuffer (ctrlbuf) for both directions, so its analogous copy can never\\nleave the allocation.\\n\\nFound by code review.  The out-of-bounds read was confirmed under\\nAddressSanitizer with a faithful userspace model of usbio_bulk_msg()\u0027s\\nreceive path (an rxbuf_len-sized buffer, the same act/ibuf_len/bpkt_len\\nchecks and the memcpy).  A USB raw-gadget + dummy_hcd reproducer is\\nalso available.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/misc/usbio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"121a0f839dbb397af5fabb701cea3e9983223e50\",\"lessThan\":\"48394f94211cf8fe0ea8604fc441633abf90fc94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"121a0f839dbb397af5fabb701cea3e9983223e50\",\"lessThan\":\"fc1b546973c1442d5b947fcdd03581f20ecc5bd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"121a0f839dbb397af5fabb701cea3e9983223e50\",\"lessThan\":\"8c6314489550fa81d41723a0ff33f655b5b6c7b6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/misc/usbio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/48394f94211cf8fe0ea8604fc441633abf90fc94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c6314489550fa81d41723a0ff33f655b5b6c7b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc1b546973c1442d5b947fcdd03581f20ecc5bd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:29Z",
      "cve": "CVE-2026-64339",
      "id": "CVE-2026-64339",
      "initial_release_date": "2026-07-25T16:01:29Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64339",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64339.json",
      "version": "2"
    }
  }
}

GHSA-M28F-FMGF-V7CW

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: misc: usbio: bound bulk IN response length to the received transfer

usbio_bulk_msg() copies bpkt_len = le16_to_cpu(bpkt->len) bytes out of the bulk IN buffer (usbio->rxbuf, allocated with size usbio->rxbuf_len) into the caller's buffer. bpkt_len is fully controlled by the device and is only checked against ibuf_len; ibuf_len in turn is checked against usbio->txbuf_len, not against rxbuf_len:

if ((obuf_len > (usbio->txbuf_len - sizeof(*bpkt))) ||
    (ibuf_len > (usbio->txbuf_len - sizeof(*bpkt))))
    return -EMSGSIZE;

txbuf_len and rxbuf_len are taken independently from the bulk OUT and bulk IN endpoint wMaxPacketSize in usbio_probe(). A malicious or malfunctioning device that advertises a large bulk OUT endpoint and a small bulk IN endpoint (e.g. by claiming one of the quirk-free IDs such as the Lattice NX33U, 0x2ac1:0x20cb) therefore makes ibuf_len, and hence the device-supplied bpkt_len, exceed rxbuf_len. memcpy() then reads up to txbuf_len - rxbuf_len bytes past the end of the rxbuf slab object. The over-read bytes are handed back to the i2c layer and on to user space through i2c-dev, disclosing adjacent slab memory; with KASAN this is reported as a slab-out-of-bounds read.

The number of bytes actually received is already known: act equals the URB actual_length and is bounded by rxbuf_len. Reject any response that claims more payload than was received, mirroring the existing "act < sizeof(*bpkt)" check just above.

The control path (usbio_ctrl_msg()) is not affected: it uses a single buffer (ctrlbuf) for both directions, so its analogous copy can never leave the allocation.

Found by code review. The out-of-bounds read was confirmed under AddressSanitizer with a faithful userspace model of usbio_bulk_msg()'s receive path (an rxbuf_len-sized buffer, the same act/ibuf_len/bpkt_len checks and the memcpy). A USB raw-gadget + dummy_hcd reproducer is also available.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64339"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: misc: usbio: bound bulk IN response length to the received transfer\n\nusbio_bulk_msg() copies bpkt_len = le16_to_cpu(bpkt-\u003elen) bytes out of\nthe bulk IN buffer (usbio-\u003erxbuf, allocated with size usbio-\u003erxbuf_len)\ninto the caller\u0027s buffer.  bpkt_len is fully controlled by the device\nand is only checked against ibuf_len; ibuf_len in turn is checked\nagainst usbio-\u003etxbuf_len, not against rxbuf_len:\n\n\tif ((obuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))) ||\n\t    (ibuf_len \u003e (usbio-\u003etxbuf_len - sizeof(*bpkt))))\n\t\treturn -EMSGSIZE;\n\ntxbuf_len and rxbuf_len are taken independently from the bulk OUT and\nbulk IN endpoint wMaxPacketSize in usbio_probe().  A malicious or\nmalfunctioning device that advertises a large bulk OUT endpoint and a\nsmall bulk IN endpoint (e.g. by claiming one of the quirk-free IDs such\nas the Lattice NX33U, 0x2ac1:0x20cb) therefore makes ibuf_len, and\nhence the device-supplied bpkt_len, exceed rxbuf_len.  memcpy() then\nreads up to txbuf_len - rxbuf_len bytes past the end of the rxbuf slab\nobject.  The over-read bytes are handed back to the i2c layer and on to\nuser space through i2c-dev, disclosing adjacent slab memory; with KASAN\nthis is reported as a slab-out-of-bounds read.\n\nThe number of bytes actually received is already known: act equals the\nURB actual_length and is bounded by rxbuf_len.  Reject any response\nthat claims more payload than was received, mirroring the existing\n\"act \u003c sizeof(*bpkt)\" check just above.\n\nThe control path (usbio_ctrl_msg()) is not affected: it uses a single\nbuffer (ctrlbuf) for both directions, so its analogous copy can never\nleave the allocation.\n\nFound by code review.  The out-of-bounds read was confirmed under\nAddressSanitizer with a faithful userspace model of usbio_bulk_msg()\u0027s\nreceive path (an rxbuf_len-sized buffer, the same act/ibuf_len/bpkt_len\nchecks and the memcpy).  A USB raw-gadget + dummy_hcd reproducer is\nalso available.",
  "id": "GHSA-m28f-fmgf-v7cw",
  "modified": "2026-07-25T12:31:32Z",
  "published": "2026-07-25T12:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64339"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48394f94211cf8fe0ea8604fc441633abf90fc94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c6314489550fa81d41723a0ff33f655b5b6c7b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc1b546973c1442d5b947fcdd03581f20ecc5bd2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64339 (GCVE-0-2026-64339)

GHSA-M28F-FMGF-V7CW

Tags

Sightings

Nomenclature