Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ovpn: fix possible use-after-free in ovpn_net_xmit When building the skb_list in ovpn_net_xmit, skb_share_check will free the original skb if it is shared. The current implementation continues to use the stale skb pointer for subsequent operations: - peer lookup, - skb_dst_drop (even though all segments produced by skb_gso_segment will have a dst attached), - ovpn_peer_stats_increment_tx. Fix this by moving the peer lookup and skb_dst_drop before segmentation so that the original skb is still valid when used. Return early if all segments fail skb_share_check and the list ends up empty. Also switch ovpn_peer_stats_increment_tx to use skb_list.next; the next patch fixes the stats logic.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 08857b5ec5d91d83e69e40a36554a8c7557b7301 before 3e4fbcb4e078915367ba5576cd70d76dbc970f95; affected 08857b5ec5d91d83e69e40a36554a8c7557b7301 before 442915c96a9bff1c7080e2aedabb1c03faa28d81; affected 08857b5ec5d91d83e69e40a36554a8c7557b7301 before a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41 |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.