CVE-2025-39673
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
ppp: fix race conditions in ppp_fill_forward_path
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | 9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7 | Unavailable | None listed |
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | 0f1630be6fcca3f0c63e4b242ad202e5cde28a40 | Unavailable | None listed |
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | ca18d751bcc9faf5b7e82e9fae1223d103928181 | Unavailable | None listed |
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | 94731cc551e29511d85aa8dec61a6c071b1f2430 | Unavailable | None listed |
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | f97f6475fdcb3c28ff3c55cc4b7bde632119ec08 | Unavailable | None listed |
| f6efc675c9dd8d93f826b79ae7e33e03301db609 | affected | git | 0417adf367a0af11adf7ace849af4638cfb573f7 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.13 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.13 | Unavailable | None listed |
| 5.15.190 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.149 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.103 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.44 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.16.4 | unaffected | semver | Unavailable | 6.16.* | None listed |
| 6.17 | unaffected | original_commit_for_fix | Unavailable | * | None listed |