ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS
CVE-2026-23459 · published 3 Apr 2026
How serious is it
- Severity: high, CVSS score 8.2 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-23459?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 1db9041e91ac574f1cecc0e98e69ac35832e8088 to < 127c5e6e2d6fa8185314537c08204ec3515eae99, cb1c1f3b7ef908408064734fb6bdaf5811b8b84c to < e40e2d11ced8119d3e4469ebe91264bc1cf71530, be226352e8dc77d3313c096b2d8e7f69bf6980fc to < 5d562153b4719234227f99c2fb529f98a6a44d15, be226352e8dc77d3313c096b2d8e7f69bf6980fc to < 0d087d00161f562d5047cc4009bb0c6a19daf9f1
- Linux Linux: 6.14
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/127c5e6e2d6fa8185314537c08204ec3515eae99
- git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530
- git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15
- git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1
- git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON