Vulnerability-Lookup

CVE-2026-63960 (GCVE-0-2026-63960)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 06:41

Title

usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer() wcove_read_rx_buffer() copies the PD RX FIFO into the caller's struct pd_message with for (i = 0; i < USBC_RXINFO_RXBYTES(info); i++) regmap_read(wcove->regmap, USBC_RX_DATA + i, msg + i); which has two problems: USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message is 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed). The byte count latched in RXINFO is the number of bytes the port partner put on the wire, so a malicious partner that transmits a 31-byte frame can drive the loop one byte past the destination if the WCOVE BMC receiver does not enforce the PD object-count limit in hardware. The existing FIXME flagged this as unverified. Independently, regmap_read() takes an unsigned int * and stores a full unsigned int at the destination. Passing the byte pointer msg + i means each iteration writes four bytes; the high three are zero (val_bits is 8) and are normally overwritten by the next iteration, but the final iteration's high bytes are not. With RXBYTES == 30 the i == 29 iteration already writes three zero bytes past msg, which sits on the IRQ thread's stack in wcove_typec_irq(). Clamp the loop to sizeof(struct pd_message) and read each register into a local before storing only its low byte, so the copy can never exceed the destination regardless of what RXINFO reports.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3e632098d0521257e…
https://git.kernel.org/stable/c/f2a1edc0bd142edab…
https://git.kernel.org/stable/c/6899f5b6d7b83ce79…
https://git.kernel.org/stable/c/5cd0e7ac4eefbdb33…
https://git.kernel.org/stable/c/d0e4b8b3c6b7607a1…
https://git.kernel.org/stable/c/e94933dc41b87503b…
https://git.kernel.org/stable/c/3f9d50c8b02b4af06…
https://git.kernel.org/stable/c/4af7ad0e6d7aa4403…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 3e632098d0521257ea965bbd6fde807d9bee5c8a (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < f2a1edc0bd142edabc6c85d88713f2bc178dd317 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 5cd0e7ac4eefbdb330f8c72694fe74e63df65552 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < d0e4b8b3c6b7607a16932556eaaca5d5cf69f192 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < e94933dc41b87503bf585c8c6d53d740620eceb9 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 3f9d50c8b02b4af0646aa892465080f9061fc89c (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa (git)	guessed
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)	guessed

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{
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/wcove.c"
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              "version": "0",
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
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              "versionType": "semver"
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      ],
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T06:41:40.389Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
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        {
          "url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
        },
        {
          "url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
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          "url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
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          "url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
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        {
          "url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
        }
      ],
      "title": "usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
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      }
    }
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    "cveId": "CVE-2026-63960",
    "datePublished": "2026-07-19T14:55:50.282Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-20T06:41:40.389Z",
    "state": "PUBLISHED"
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      "percentile": "0.10752"
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      "cve": "CVE-2026-63960",
      "id": "msrc_CVE-2026-63960",
      "initial_release_date": "2026-07-21T01:03:29.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63960.json",
      "version": "1"
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        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
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                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "6.6.143",
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                    "status": "unaffected",
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                    "status": "unaffected",
                    "version": "6.18.35",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "7.0.*",
                    "status": "unaffected",
                    "version": "7.0.12",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports."
          }
        ],
        "id": "CVE-2026-63960",
        "lastModified": "2026-07-30T14:51:11.223",
        "metrics": {},
        "published": "2026-07-19T16:17:14.897",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-08-07T13:50:20+00:00",
      "cve": "CVE-2026-63960",
      "id": "CVE-2026-63960",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63960.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2026-63960

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-30 14:51

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/wcove.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e632098d0521257ea965bbd6fde807d9bee5c8a",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "f2a1edc0bd142edabc6c85d88713f2bc178dd317",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "5cd0e7ac4eefbdb330f8c72694fe74e63df65552",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "d0e4b8b3c6b7607a16932556eaaca5d5cf69f192",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "e94933dc41b87503bf585c8c6d53d740620eceb9",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "3f9d50c8b02b4af0646aa892465080f9061fc89c",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            },
            {
              "lessThan": "4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa",
              "status": "affected",
              "version": "3c4fb9f169214290ec9a943907321e6265b36f65",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/wcove.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports."
    }
  ],
  "id": "CVE-2026-63960",
  "lastModified": "2026-07-30T14:51:11.223",
  "metrics": {},
  "published": "2026-07-19T16:17:14.897",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

GHSA-5MQJ-JPM9-CHWP

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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

usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()

wcove_read_rx_buffer() copies the PD RX FIFO into the caller's struct pd_message with

for (i = 0; i < USBC_RXINFO_RXBYTES(info); i++)
    regmap_read(wcove->regmap, USBC_RX_DATA + i, msg + i);

which has two problems:

USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message is 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed). The byte count latched in RXINFO is the number of bytes the port partner put on the wire, so a malicious partner that transmits a 31-byte frame can drive the loop one byte past the destination if the WCOVE BMC receiver does not enforce the PD object-count limit in hardware. The existing FIXME flagged this as unverified.

Independently, regmap_read() takes an unsigned int * and stores a full unsigned int at the destination. Passing the byte pointer msg + i means each iteration writes four bytes; the high three are zero (val_bits is 8) and are normally overwritten by the next iteration, but the final iteration's high bytes are not. With RXBYTES == 30 the i == 29 iteration already writes three zero bytes past msg, which sits on the IRQ thread's stack in wcove_typec_irq().

Clamp the loop to sizeof(struct pd_message) and read each register into a local before storing only its low byte, so the copy can never exceed the destination regardless of what RXINFO reports.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-63960"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports.",
  "id": "GHSA-5mqj-jpm9-chwp",
  "modified": "2026-07-19T18:31:48Z",
  "published": "2026-07-19T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63960"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-63960

Vulnerability from csaf_microsoft - Published: 2026-07-21 01:03 - Updated: 2026-07-21 01:03

Summary

usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()

Scope

1 vulnerability in this advisory, including CVE-2026-63960.

CVE-2026-63960

Known affected: 1 product

Open the full advisory

OPENSUSE-SU-2026:21555-1

Vulnerability from csaf_opensuse - Published: 2026-08-12 01:09 - Updated: 2026-10-20 09:52

Summary

Security update for the Linux Kernel

Severity

Important

Scope

894 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 136 products

Open the full advisory

SUSE-SU-2026:23066-1

Vulnerability from csaf_suse - Published: 2026-08-11 20:56 - Updated: 2026-10-20 09:48

Summary

Security update for the Linux Kernel

Severity

Important

Scope

894 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 8 products

Open the full advisory

SUSE-SU-2026:23068-1

Vulnerability from csaf_suse - Published: 2026-08-11 21:26 - Updated: 2026-10-20 09:48

Summary

Security update for the Linux Kernel

Severity

Important

Scope

894 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:23193-1

Vulnerability from csaf_suse - Published: 2026-08-18 18:56 - Updated: 2026-10-22 17:10

Summary

Security update for the Linux Kernel

Severity

Important

Scope

648 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 7 products

Open the full advisory

SUSE-SU-2026:23194-1

Vulnerability from csaf_suse - Published: 2026-08-18 19:48 - Updated: 2026-10-22 17:10

Summary

Security update for the Linux Kernel

Severity

Important

Scope

647 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 14 products

Open the full advisory

SUSE-SU-2026:23221-1

Vulnerability from csaf_suse - Published: 2026-08-11 21:26 - Updated: 2026-10-20 09:48

Summary

Security update for the Linux Kernel

Severity

Important

Scope

894 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 114 products

Open the full advisory

SUSE-SU-2026:23231-1

Vulnerability from csaf_suse - Published: 2026-08-11 21:26 - Updated: 2026-10-20 09:48

Summary

Security update for the Linux Kernel

Severity

Important

Scope

894 vulnerabilities in this advisory, including CVE-2026-63960.

CVE-2026-63960

6.8 (Medium)


                
                  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Recommended: 114 products

Open the full advisory

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CVE-2026-63960 (GCVE-0-2026-63960)

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