{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45952",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-13T15:03:33.088Z",
        "datePublished": "2026-05-27T12:18:08.442Z",
        "dateUpdated": "2026-05-27T12:18:08.442Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-27T12:18:08.442Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: Add validation for MTU changes\n\nIncreasing the MTU beyond the HDS threshold causes the hardware to\nfragment packets across multiple buffers. If a single-buffer XDP program\nis attached, the driver will drop all multi-frag frames. While we can't\nprevent a remote sender from sending non-TCP packets larger than the MTU,\nthis will prevent users from inadvertently breaking new TCP streams.\n\nTraditionally, drivers supported XDP with MTU less than 4Kb\n(packet per page). Fbnic currently prevents attaching XDP when MTU is too high.\nBut it does not prevent increasing MTU after XDP is attached."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/meta/fbnic/fbnic_netdev.c"
                    ],
                    "versions": [
                        {
                            "version": "1b0a3950dbd4fa278dc33401a4faba2a23307a16",
                            "lessThan": "d7eaa006c0444a5d4671be7efe6dbb33ef8b515e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1b0a3950dbd4fa278dc33401a4faba2a23307a16",
                            "lessThan": "03399063aa0c67fd8bdfd69467ddb849bb3b97df",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1b0a3950dbd4fa278dc33401a4faba2a23307a16",
                            "lessThan": "ccd8e87748ad083047d6c8544c5809b7f96cc8df",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/meta/fbnic/fbnic_netdev.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.14",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.4",
                            "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": "6.18",
                                    "versionEndExcluding": "6.18.14"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.19.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df"
                }
            ],
            "title": "eth: fbnic: Add validation for MTU changes",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}