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Change History

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

caif: fix integer underflow in cffrml_receive()

The cffrml_receive() function extracts a length field from the packet
header and, when FCS is disabled, subtracts 2 from this length without
validating that len >= 2.

If an attacker sends a malicious packet with a length field of 0 or 1
to an interface with FCS disabled, the subtraction causes an integer
underflow.

This can lead to memory exhaustion and kernel instability, potential
information disclosure if padding contains uninitialized kernel memory.

Fix this by validating that len >= 2 before performing the subtraction.

https://git.kernel.org/stable/c/21fdcc00656a60af3c7aae2dea8dd96abd35519c

https://git.kernel.org/stable/c/4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3

https://git.kernel.org/stable/c/785c7be6361630070790f6235b696da156ac71b3

https://git.kernel.org/stable/c/8a11ff0948b5ad09b71896b7ccc850625f9878d1

https://git.kernel.org/stable/c/f818cd472565f8b0c2c409b040e0121c5cf8592c