CVE-2026-53194
published 2026-06-25CVE-2026-53194: In the Linux kernel, the following vulnerability has been resolved: USB: serial: kl5kusb105: fix bulk-out buffer overflow klsi_105_prepare_write_buffer() is…
PriorityP342high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.15%
4.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: kl5kusb105: fix bulk-out buffer overflow
klsi_105_prepare_write_buffer() is called by the generic write path
with the bulk-out buffer and its size (bulk_out_size, 64 bytes). It
stores a two-byte length header at the start of the buffer and copies
the payload from the write fifo starting at buf + KLSI_HDR_LEN, but
passes the full buffer size as the number of bytes to copy:
count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN,
size, &port->lock);
When the fifo holds at least size bytes, size bytes are copied starting
two bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its
end. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for
the header as safe_serial already does.
Writing bulk_out_size or more bytes to the tty triggers a slab
out-of-bounds write, observed with KASAN by emulating the device with
dummy_hcd and raw-gadget:
BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0
Write of size 64 at addr ffff888112c62202 by task python3
kfifo_copy_out
klsi_105_prepare_write_buffer [kl5kusb105]
usb_serial_generic_write_start [usbserial]
Allocated by task 139:
usb_serial_probe [usbserial]
The buggy address is located 2 bytes inside of allocated 64-byte region
The out-of-bounds write no longer occurs with this change applied.
Affected
24 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 60af1fd82983c26604102e63a3fcc822c186cceb | 60af1fd82983c26604102e63a3fcc822c186cceb |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 0a57320f71941d4e0b1307453c9a1f0939afe666 | 0a57320f71941d4e0b1307453c9a1f0939afe666 |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 14147b7963685957839c76ba8094924e22777d79 | 14147b7963685957839c76ba8094924e22777d79 |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < a1288cd700f721c1a119c4f1e8efa234e59caada | a1288cd700f721c1a119c4f1e8efa234e59caada |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 70d86e355c564b5510fde61361df014f5476c83e | 70d86e355c564b5510fde61361df014f5476c83e |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 372f33ebed747d91870f57c0a2e62884a870bffa | 372f33ebed747d91870f57c0a2e62884a870bffa |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < bde742b076cbe26ecc89c8c68c76ae076a524d02 | bde742b076cbe26ecc89c8c68c76ae076a524d02 |
| linux | linux | >= 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 < 96d47e40bf9db4a9efd5c8fb53287a508d165f14 | 96d47e40bf9db4a9efd5c8fb53287a508d165f14 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 2.6.35 < 5.10.259 | 5.10.259 |
| linux | linux_kernel | >= 5.11 < 5.15.210 | 5.15.210 |
| linux | linux_kernel | >= 5.16 < 6.1.176 | 6.1.176 |
| linux | linux_kernel | >= 6.13 < 6.18.36 | 6.18.36 |
| linux | linux_kernel | >= 6.19 < 7.0.13 | 7.0.13 |
| linux | linux_kernel | >= 6.2 < 6.6.143 | 6.6.143 |
| linux | linux_kernel | >= 6.7 < 6.12.94 | 6.12.94 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat7.0HIGH
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Red Hat
kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow
vendor_redhat·2026-06-25·CVSS 7.0
CVE-2026-53194 [HIGH] CWE-787 kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow
kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: kl5kusb105: fix bulk-out buffer overflow
klsi_105_prepare_write_buffer() is called by the generic write path
with the bulk-out buffer and its size (bulk_out_size, 64 bytes). It
stores a two-byte length header at the start of the buffer and copies
the payload from the write fifo starting at buf + KLSI_HDR_LEN, but
passes the full buffer size as the number of bytes to copy:
count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN,
size, &port->lock);
When the fifo holds at least size bytes, size bytes are copied starting
two bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its
end. Copy at most size - KLSI_HDR_LEN bytes instead,
GHSA
In the Linux kernel, the following vulnerability has been resolved: USB: serial: kl5kusb105: fix bulk-out buffer overflow klsi_105_prepare_write_buffer() is called by the generic write path with the
ghsa_unreviewed·2026-06-25
CVE-2026-53194 In the Linux kernel, the following vulnerability has been resolved: USB: serial: kl5kusb105: fix bulk-out buffer overflow klsi_105_prepare_write_buffer() is called by the generic write path with the
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: kl5kusb105: fix bulk-out buffer overflow
klsi_105_prepare_write_buffer() is called by the generic write path
with the bulk-out buffer and its size (bulk_out_size, 64 bytes). It
stores a two-byte length header at the start of the buffer and copies
the payload from the write fifo starting at buf + KLSI_HDR_LEN, but
passes the full buffer size as the number of bytes to copy:
count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN,
size, &port->lock);
When the fifo holds at least size bytes, size bytes are copied starting
two bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its
end. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for
the header as safe_serial already does.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0a57320f71941d4e0b1307453c9a1f0939afe666https://git.kernel.org/stable/c/14147b7963685957839c76ba8094924e22777d79https://git.kernel.org/stable/c/372f33ebed747d91870f57c0a2e62884a870bffahttps://git.kernel.org/stable/c/60af1fd82983c26604102e63a3fcc822c186ccebhttps://git.kernel.org/stable/c/70d86e355c564b5510fde61361df014f5476c83ehttps://git.kernel.org/stable/c/96d47e40bf9db4a9efd5c8fb53287a508d165f14https://git.kernel.org/stable/c/a1288cd700f721c1a119c4f1e8efa234e59caadahttps://git.kernel.org/stable/c/bde742b076cbe26ecc89c8c68c76ae076a524d02https://access.redhat.com/security/cve/CVE-2026-53194https://bugzilla.redhat.com/show_bug.cgi?id=2492703https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53194.json
2026-06-25
Published