What’s Vulnerable › Vulnerabilities

CVE-2026-23459: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-10-21

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.

Affected products

• Linux kernel: from 6.14 before 6.19.10; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4 — fixed in 6.19.10

How to fix

Upgrade to a fixed version: Linux kernel 6.19.10. Check the vendor advisory for mitigations.

References

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

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