{
  "cveId": "CVE-2026-63960",
  "url": "https://patchblox.com/security/cve/CVE-2026-63960",
  "summary": "CVE-2026-63960 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-63960, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()  wcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s struct pd_message with  \tfor (i = 0; i \u003C USBC_RXINFO_RXBYTES(info); i\u002B\u002B) \t\tregmap_read(wcove-\u003Eregmap, USBC_RX_DATA \u002B i, msg \u002B i);  which has two problems:  USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message is 30 bytes (__le16 header \u002B __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 \u002B 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\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration already writes three zero bytes past msg, which sits on the IRQ thread\u0027s 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.",
  "published": "2026-07-19T16:17:14Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00156,
  "epssPercentile": 0.0475,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63960",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
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      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
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      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
    },
    {
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      "fix": "SUSE-SU-2026:3790-1",
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      "released": "2026-08-25T12:24:44Z"
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      "fix": "SUSE-SU-2026:23231-1",
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      "released": "2026-08-11T21:26:34Z"
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      "product": "kernel-azure",
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  "noFixYet": [],
  "dataAsOf": "2026-11-10T20:03:11Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}