Tracker / CVE-2023-53338
CVE-2023-53338
In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes. To fix the incorrect behavior, skb_do_redirect return values can be simply discarded, the same as tc-egress behavior. On the other hand, bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU information. Thus convert its return values to avoid the conflict with LWTUNNEL_XMIT_CONTINUE.
Affected products and versions
| linux | linux_kernel · 4.10 → 5.4.257 |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.132 |
| linux | linux_kernel · 5.16 → 6.1.53 |
| linux | linux_kernel · 5.5 → 5.10.195 |
| linux | linux_kernel · 6.2 → 6.4.16 |
| linux | linux_kernel · 6.5 → 6.5.3 |