CVE-2025-21768net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 21, 2026
Affected products
Linux Linux linux:linux (from the name) | from 6c8702c60b88651072460f3f4026c7dfe2521d12 before e2ef3fa31353b30bda94358fe5205c141289746d; 6c8702c60b88651072460f3f4026c7dfe2521d12 builds before 5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a; 6c8702c60b88651072460f3f4026c7dfe2521d12 builds before 4c0f200c7d06fedddde82209c099014d63f4a6c0; from 6c8702c60b88651072460f3f4026c7dfe2521d12 before 92191dd1073088753821b862b791dcc83e558e07 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.10 before 6.12.16; from 6.13 before 6.13.4; 6.14 | NVD |
References
- https://git.kernel.org/stable/c/e2ef3fa31353b30bda94358fe5205c141289746d
- https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7apatch
- https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0patch
- https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.