In the Linux kernel, the following vulnerability has been resolved:
forcedeth: fix UAF of txrx_stats in nv_remove
nv_remove() frees the per-CPU txrx_stats before unregister_netdev(). Until unregister completes, ndo_get_stats64, the NAPI/xmit data path, and nv_close()/drain may still access txrx_stats, leading to a use-after-free.
Free the stats only after unregister_netdev().
References
- https://git.kernel.org/stable/c/201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1
- https://git.kernel.org/stable/c/22666ba1420164753d7b0f5a841986b25ace5435
- https://git.kernel.org/stable/c/ae20a8a4de06a289d40b0a0633d8d573f1fcb049
- https://git.kernel.org/stable/c/c9d24a205fd508b9999fcab6aca4c590490a12cf
- https://git.kernel.org/stable/c/cf2dcde2284562ff87830ca0b7fa2b06e95aef1e