Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before 9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7; affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before 0f1630be6fcca3f0c63e4b242ad202e5cde28a40; affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before ca18d751bcc9faf5b7e82e9fae1223d103928181; affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before 94731cc551e29511d85aa8dec61a6c071b1f2430; affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before f97f6475fdcb3c28ff3c55cc4b7bde632119ec08; affected f6efc675c9dd8d93f826b79ae7e33e03301db609 before 0417adf367a0af11adf7ace849af4638cfb573f7 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.190 through 5.15.*; unaffected 6.1.149 through 6.1.*; unaffected 6.6.103 through 6.6.*; unaffected 6.12.44 through 6.12.*; unaffected 6.16.4 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7
- https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40
- https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181
- https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430
- https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08
- https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7
ADP enrichment
No English description supplied.
No English description supplied.
No English description supplied.
No references supplied.