{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31782",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.141Z",
        "datePublished": "2026-05-01T14:15:08.586Z",
        "dateUpdated": "2026-08-05T12:25:09.961Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:25:09.961Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86: Fix potential bad container_of in intel_pmu_hw_config\n\nAuto counter reload may have a group of events with software events\npresent within it. The software event PMU isn't the x86_hybrid_pmu and\na container_of operation in intel_pmu_set_acr_caused_constr (via the\nhybrid helper) could cause out of bound memory reads. Avoid this by\nguarding the call to intel_pmu_set_acr_caused_constr with an\nis_x86_event check."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached through the local perf_event_open() syscall by creating a crafted perf hardware event group containing a software event.\nAC:L - An attacker controls the event group layout and acr_mask/config2 values needed to hit the bad sibling handling; no race or victim-controlled timing is required.\nPR:L - A basic local user can reach per-task perf events, especially with user-only sampling attributes such as exclude_kernel set; system-wide or kernel profiling privileges are not required for the vulnerable initialization path.\nUI:N - No victim action is needed beyond the attacker issuing perf_event_open() calls.\nS:U - The bug is in the kernel perf/x86 subsystem and impacts the same kernel security authority, with no VM, IOMMU, or sandbox boundary change.\nC:H - The bug performs an out-of-bounds kernel memory read by treating a software PMU as an x86_hybrid_pmu through container_of; under the required conservative scoring, this kernel OOB read is high confidentiality impact.\nI:H - The bad container_of is a kernel type-confusion-style memory safety flaw in perf event group configuration; conservatively, such corruption of kernel object interpretation is scored as potentially allowing high integrity impact.\nA:H - The crafted event group can repeatedly trigger the invalid kernel memory access from an unprivileged local context, which can produce a kernel fault/oops or panic on affected builds."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/events/intel/core.c"
                    ],
                    "versions": [
                        {
                            "version": "ec980e4facef8110f6fce27e5b6344660117f01f",
                            "lessThan": "e435a30ca6fe14c9611b1fc731c98a6d28410247",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec980e4facef8110f6fce27e5b6344660117f01f",
                            "lessThan": "bfee04838f636d064bc92075c65c95f739003804",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec980e4facef8110f6fce27e5b6344660117f01f",
                            "lessThan": "dbde07f06226438cd2cf1179745fa1bec5d8914a",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/events/intel/core.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "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": "6.16",
                                    "versionEndExcluding": "6.18.22"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.19.12"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e435a30ca6fe14c9611b1fc731c98a6d28410247"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bfee04838f636d064bc92075c65c95f739003804"
                },
                {
                    "url": "https://git.kernel.org/stable/c/dbde07f06226438cd2cf1179745fa1bec5d8914a"
                }
            ],
            "title": "perf/x86: Fix potential bad container_of in intel_pmu_hw_config",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}