CVE-2021-47236

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.

• linux linux kernel (>= 2.6.30 < 4.4.274) • linux linux kernel (>= 4.5 < 4.9.274) • linux linux kernel (>= 4.10 < 4.14.238) • linux linux kernel (>= 4.15 < 4.19.196) • linux linux kernel (>= 4.20 < 5.4.128) • linux linux kernel (>= 5.5 < 5.10.46) • linux linux kernel (>= 5.11 < 5.12.13) • linux linux kernel 5.13