CVE-2026-23459

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1Patch
• https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132Patch
• https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15
• https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530