CVE-2021-47236 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: cdc_eem: fix tx fixup skb leak

when usbnet transmit a skb eem fixup it in eem_tx_fixup() if skb_copy_expand() failed it return NULL usbnet_start_xmit() will have no chance to free original skb.

fix it by free orginal skb in eem_tx_fixup() first then check skb clone status if failed return NULL to usbnet.

Reference

https://git.kernel.org/stable/c/f12554b0ff639e74612cc01b3b4a049e098d2d65 https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f https://git.kernel.org/stable/c/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7