CVE-2025-21768

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels Some lwtunnels have a dst cache for post-transformation dst. If the packet destination did not change we may end up recording a reference to the lwtunnel in its own cache, and the lwtunnel state will never be freed. Discovered by the ioam6.sh test, kmemleak was recently fixed to catch per-cpu memory leaks. I'm not sure if rpl and seg6 can actually hit this, but in principle I don't see why not.

The following products are affected by CVE-2025-21768 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21768.

URL	Resource
https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0
https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a
https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07
https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21768-512b@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21768
https://www.cve.org/CVERecord?id=CVE-2025-21768