{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-23459",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-01-13T15:37:46.021Z",
        "datePublished": "2026-04-03T15:15:39.665Z",
        "dateUpdated": "2026-08-23T12:45:29.221Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-23T12:45:29.221Z"
            },
            "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."
                }
            ],
            "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/netdevice.h",
                        "include/net/ip_tunnels.h"
                    ],
                    "versions": [
                        {
                            "version": "cb1c1f3b7ef908408064734fb6bdaf5811b8b84c",
                            "lessThan": "e40e2d11ced8119d3e4469ebe91264bc1cf71530",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc",
                            "lessThan": "0d087d00161f562d5047cc4009bb0c6a19daf9f1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc",
                            "lessThan": "8431c602f551549f082bbfa67f3003f2d8e3e132",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1db9041e91ac574f1cecc0e98e69ac35832e8088",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.6.153",
                            "lessThan": "6.7",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/netdevice.h",
                        "include/net/ip_tunnels.h"
                    ],
                    "versions": [
                        {
                            "version": "6.14",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.14",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.10",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "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"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6.153"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132"
                }
            ],
            "title": "ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
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}