Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:ppp: fix race conditions in ppp_fill_forward_pathppp_fill_forward_path() has two race conditions:1. The ppp->channels list can change between list_empty() and list_first_entry(), as ppp_lock() is not held. If the only channel is deleted in ppp_disconnect_channel(), list_first_entry() may access an empty head or a freed entry, and trigger a panic.2. pch->chan can be NULL. When ppp_unregister_channel() is called, pch->chan is set to NULL before pch is removed from ppp->channels.Fix these by using a lockless RCU approach:- Use list_first_or_null_rcu() to safely test and access the first list entry.- Convert list modifications on ppp->channels to their RCU variants and add synchronize_net() after removal.- Check for a NULL pch->chan before dereferencing it.
No PoCs from references.
- https://github.com/w4zu/Debian_security