Vulnerability Database

299,749

Total vulnerabilities in the database

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.

  • Published: Feb 27, 2025
  • Updated: Nov 4, 2025
  • CVE: CVE-2025-21768
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.5
  • AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
linux / linux_kernel 4.10 6.12.16
linux / linux_kernel 6.13 6.13.4
linux / linux_kernel 6.14-rc1 6.14-rc1.x