{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64028",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.028Z",
        "datePublished": "2026-07-19T15:39:19.102Z",
        "dateUpdated": "2026-07-19T15:39:19.102Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-07-19T15:39:19.102Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Avoid NULL return from hist_field_name() on truncation\n\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL->\"\" guard. Callers don't expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\n\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup'd from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\n\nKeep the length check but leave field_name as \"\" on overflow."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/trace/trace_events_hist.c"
                    ],
                    "versions": [
                        {
                            "version": "2e8578364061c4e88ae33bc20c2d6f64f365f6a2",
                            "lessThan": "e3f5d42cdc2f167719564693675f1eead81378ea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dfd1cd57ee6067301841b7b0967c70f910a51150",
                            "lessThan": "37377b39ff86dacbc533275c1155210d4fd5dc91",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e5c223f46c2e0691461dd97510c15e1f77148872",
                            "lessThan": "0402a1d3ddec565132867337ed44514a09d84728",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9399a92989354e34086f9a5c379493217df83c5e",
                            "lessThan": "e91687643c440ca3997d67646e6f80b92edc6703",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0",
                            "lessThan": "be4e99038c1603fa6b329d8ee3e364825e17c353",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0402c60abe769098d77f3b3bd1e29a97922b614b",
                            "lessThan": "d6c8b3ebdcdb12b59ad4212acb137cc56cae453d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6929e650db8451a9975ac0a631ba2d6e5d1e80ba",
                            "lessThan": "915c1254fe0788abddc31095b360e9dc98907a34",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5ec1d1e97de134beed3a5b08235a60fc1c51af96",
                            "lessThan": "576ec047d20b368b43c4d5db98c4f2e0f3c101ec",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/trace/trace_events_hist.c"
                    ],
                    "versions": [
                        {
                            "version": "6.6.141",
                            "lessThan": "6.6.142",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.91",
                            "lessThan": "6.12.92",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThan": "6.18.34",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "lessThan": "7.0.11",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6.141",
                                    "versionEndExcluding": "6.6.142"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12.91",
                                    "versionEndExcluding": "6.12.92"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18.33",
                                    "versionEndExcluding": "6.18.34"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0.10",
                                    "versionEndExcluding": "7.0.11"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea"
                },
                {
                    "url": "https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703"
                },
                {
                    "url": "https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34"
                },
                {
                    "url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"
                }
            ],
            "title": "tracing: Avoid NULL return from hist_field_name() on truncation",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}