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Tracker / CVE-2025-39673

CVE-2025-39673

Critica 9.8

In the Linux kernel, the following vulnerability has been resolved: ppp: fix race conditions in ppp_fill_forward_path ppp_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.

Prodotti e versioni affette

debian debian_linux
linux linux_kernel
linux linux_kernel · 5.13 → 5.15.190
linux linux_kernel · 5.16 → 6.1.149
linux linux_kernel · 6.13 → 6.16.4
linux linux_kernel · 6.2 → 6.6.103
linux linux_kernel · 6.7 → 6.12.44

Analisi

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Riferimenti