Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
ovpn: fix NULL dereference when killing missing key
ovpn_crypto_kill_key assumes both crypto slots are populated and dereferences each slot before checking it. That is not guaranteed: a peer can have only one installed key, and the kill path may be asked to remove a key that is not present.
Read each slot once while holding the crypto state lock, check for NULL before looking at key_id, and only replace the slot that actually matches.
Details
- Affected product:
- Debian 10 ELS
- Affected packages:
- linux @ 4.19.0