AZL-67007
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-67007.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-67007
- Upstream
- Published
- 2025-09-05T18:15:43Z
- Modified
- 2026-04-01T05:21:06.206134Z
- Summary
- CVE-2025-39673 affecting package kernel for versions less than 6.6.104.2-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ppp: fix race conditions in pppfillforward_path
pppfillforward_path() has two race conditions:
The ppp->channels list can change between listempty() and listfirstentry(), as ppplock() is not held. If the only channel is deleted in pppdisconnectchannel(), listfirstentry() may access an empty head or a freed entry, and trigger a panic.
pch->chan can be NULL. When pppunregisterchannel() is called, pch->chan is set to NULL before pch is removed from ppp->channels.
Fix these by using a lockless RCU approach: - Use listfirstornullrcu() 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.
- References