{"id":"CVE-2026-23459","state":"PUBLISHED","title":"ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it.","publishedAt":"2026-04-03T15:15:39.665Z","updatedAt":"2026-10-21T12:39:14.669Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1db9041e91ac574f1cecc0e98e69ac35832e8088","status":"affected","lessThan":"127c5e6e2d6fa8185314537c08204ec3515eae99","versionType":"git"},{"version":"cb1c1f3b7ef908408064734fb6bdaf5811b8b84c","status":"affected","lessThan":"e40e2d11ced8119d3e4469ebe91264bc1cf71530","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"5d562153b4719234227f99c2fb529f98a6a44d15","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"0d087d00161f562d5047cc4009bb0c6a19daf9f1","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"8431c602f551549f082bbfa67f3003f2d8e3e132","versionType":"git"},{"version":"6.6.153","status":"affected","lessThan":"6.6.160","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netdevice.h","include/net/ip_tunnels.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netdevice.h","include/net/ip_tunnels.h"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23459.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23459","state":"PUBLISHED","datePublished":"2026-04-03T15:15:39.665Z","dateUpdated":"2026-10-21T12:39:14.669Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:46.021Z"},"containers":{"cna":{"title":"ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1db9041e91ac574f1cecc0e98e69ac35832e8088","status":"affected","lessThan":"127c5e6e2d6fa8185314537c08204ec3515eae99","versionType":"git"},{"version":"cb1c1f3b7ef908408064734fb6bdaf5811b8b84c","status":"affected","lessThan":"e40e2d11ced8119d3e4469ebe91264bc1cf71530","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"5d562153b4719234227f99c2fb529f98a6a44d15","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"0d087d00161f562d5047cc4009bb0c6a19daf9f1","versionType":"git"},{"version":"be226352e8dc77d3313c096b2d8e7f69bf6980fc","status":"affected","lessThan":"8431c602f551549f082bbfa67f3003f2d8e3e132","versionType":"git"},{"version":"6.6.153","status":"affected","lessThan":"6.6.160","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netdevice.h","include/net/ip_tunnels.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netdevice.h","include/net/ip_tunnels.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/127c5e6e2d6fa8185314537c08204ec3515eae99"},{"url":"https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530"},{"url":"https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15"},{"url":"https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1"},{"url":"https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","baseScore":8.2,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - An unauthenticated remote peer can trigger the affected VXLAN/Geneve tunnel transmit path by sending traffic that a configured host routes or bridges out through the tunnel. This reaches `udp_tunnel[6]_xmit_skb()` and then `iptunnel_xmit_stats()` via normal network packet forwarding/output.\nAC:L - Once an affected 32-bit VXLAN/Geneve deployment exists, triggering is just repeated packet transmission through the tunnel. There is no attacker-uncontrolled race or fragile timing requirement.\nPR:N - For an already configured tunnel endpoint, the attacker does not need local privileges or authentication to cause network traffic to traverse the vulnerable transmit path. Although creating such devices requires `CAP_NET_ADMIN`, exploitation of an existing network-facing deployment does not.\nUI:N - No victim user action is required. Packet forwarding/output and statistics updates occur automatically in the kernel.\nS:U - The vulnerable code and the resulting corruption/freeze are within the same kernel/network-device security authority. This is not a VM escape or cross-authority boundary bypass.\nC:N - The bug corrupts per-CPU tunnel statistics/synchronization state rather than exposing kernel memory. No plausible arbitrary read or information disclosure primitive is evident.\nI:L - The direct integrity impact is limited corruption of network device statistics fields due to using the wrong per-CPU stats layout. The fixed write pattern does not provide a general arbitrary write or control-flow primitive.\nA:H - On 32-bit kernels, the wrong `syncp` offset can corrupt sequence/stat state and cause freezes or repeated kernel-side stalls when stats are read. This can produce a high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:39:14.669Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.153","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}