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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcb1c1f3b7ef908408064734fb6bdaf5811b8b84c < e40e2d11ced8119d3e4469ebe91264bc1cf71530affected
LinuxLinuxbe226352e8dc77d3313c096b2d8e7f69bf6980fc < 5d562153b4719234227f99c2fb529f98a6a44d15affected
LinuxLinuxbe226352e8dc77d3313c096b2d8e7f69bf6980fc < 0d087d00161f562d5047cc4009bb0c6a19daf9f1affected
LinuxLinuxbe226352e8dc77d3313c096b2d8e7f69bf6980fc < 8431c602f551549f082bbfa67f3003f2d8e3e132affected
LinuxLinux1db9041e91ac574f1cecc0e98e69ac35832e8088affected
LinuxLinux6.6.153 < 6.7affected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References