492 lines
24 KiB
JSON
492 lines
24 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2026-53194",
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"state": "PUBLISHED",
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"dateReserved": "2026-06-09T07:44:35.390Z",
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"datePublished": "2026-06-25T08:39:05.017Z",
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"dateUpdated": "2026-10-19T19:57:28.103Z"
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: kl5kusb105: fix bulk-out buffer overflow\n\nklsi_105_prepare_write_buffer() is called by the generic write path\nwith the bulk-out buffer and its size (bulk_out_size, 64 bytes). It\nstores a two-byte length header at the start of the buffer and copies\nthe payload from the write fifo starting at buf + KLSI_HDR_LEN, but\npasses the full buffer size as the number of bytes to copy:\n\n count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN,\n size, &port->lock);\n\nWhen the fifo holds at least size bytes, size bytes are copied starting\ntwo bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its\nend. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for\nthe header as safe_serial already does.\n\nWriting bulk_out_size or more bytes to the tty triggers a slab\nout-of-bounds write, observed with KASAN by emulating the device with\ndummy_hcd and raw-gadget:\n\n BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0\n Write of size 64 at addr ffff888112c62202 by task python3\n kfifo_copy_out\n klsi_105_prepare_write_buffer [kl5kusb105]\n usb_serial_generic_write_start [usbserial]\n Allocated by task 139:\n usb_serial_probe [usbserial]\n The buggy address is located 2 bytes inside of allocated 64-byte region\n\nThe out-of-bounds write no longer occurs with this change applied."
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}
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"baseScore": 7.8,
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"value": "AV:L - Although this is USB serial code, the vulnerable copy is reached by a local write to the registered /dev/ttyUSB device once a matching adapter is present.\nAC:L - Writing bulk_out_size or more bytes deterministically fills the FIFO and triggers the out-of-bounds copy; no race or attacker-uncontrolled timing is required.\nPR:L - There is no capability or authentication check in the tty/USB-serial write path, but the attacker needs local access to open and write the tty device.\nUI:N - The attacker can trigger the bug directly by writing to the tty device; no separate victim action is required.\nS:U - The corruption occurs within the host kernel and does not cross a VM, IOMMU, or similar security authority boundary.\nC:H - The bug is kernel heap memory corruption, and the overlong bulk-out URB may also expose adjacent heap bytes to the USB device.\nI:H - The attacker controls the data copied past the 64-byte bulk-out buffer, making this an out-of-bounds kernel heap write.\nA:H - The issue was observed as a KASAN slab out-of-bounds write and can reasonably cause kernel memory corruption, oops, or panic."
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"dateUpdated": "2026-07-15T00:44:36.635Z"
|
|
}
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-53194",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:26:39.976114Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-787",
|
|
"description": "CWE-787 Out-of-bounds Write"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T19:57:28.103Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |