CVE-2025-21768
N/A
N/A
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 6c8702c60b88651072460f3f4026c7dfe2521d12 < 5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a | affected |
| Linux | Linux | 6c8702c60b88651072460f3f4026c7dfe2521d12 < 4c0f200c7d06fedddde82209c099014d63f4a6c0 | affected |
| Linux | Linux | 6c8702c60b88651072460f3f4026c7dfe2521d12 < 92191dd1073088753821b862b791dcc83e558e07 | affected |
| Linux | Linux | 4.10 | affected |
| Linux | Linux | 0 < 4.10 | unaffected |
| Linux | Linux | 6.12.16 <= 6.12.* | unaffected |
| Linux | Linux | 6.13.4 <= 6.13.* | unaffected |
| Linux | Linux | 6.14 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a
- https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0
- https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07
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