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

hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer

adm1266_pmbus_block_xfer() copies the device-supplied block payload
into the caller-provided buffer using the device-supplied length:

	memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);

The helper does not know how large data_r is and trusts the device to
return at most one record's worth of bytes.  adm1266_nvmem_read_blackbox()
violates that contract: it advances read_buff inside data->dev_mem in
ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to
write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes.  A device that returns
more than 64 bytes on the trailing record (read_buff offset 1984 in
the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes
before the post-call

	if (ret != ADM1266_BLACKBOX_SIZE)
		return -EIO;

can reject the response.

Contain the fix in the caller without changing the helper signature:
read each record into a 255-byte local bounce buffer that matches the
helper's maximum output, validate the returned length, and only then
copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.

https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7

https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba

https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126

https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c

https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0

https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f

https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb

https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0

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