{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80718",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.788Z",
        "datePublished": "2026-08-28T06:53:15.490Z",
        "dateUpdated": "2026-08-28T06:53:15.490Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-28T06:53:15.490Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()\n\nIn pcpu_create_chunk(), nr_pages is the total contiguous backing\nallocation, i.e., nr_units * pcpu_unit_pages, but pcpu_chunk_populated()\nuses it to set chunk->populated, whose size is pcpu_unit_pages, bitmap. \nSince bit N in chunk->populated means page offset N inside every unit is\nbacked.  When nr_units > 1, the function writes beyond chunk->populated. \nFix it by using chunk->nr_pages.\n\nIt also fixes the global pcpu_nr_empty_pop_pages accounting, since\npcpu_balance_free() only iterates up to chunk->nr_pages.\n\nCommit a63d4ac4ab609 (\"percpu: make percpu-km set chunk->populated bitmap\nproperly\") introduced the bitmap overflow issue.  Later, commit\nb539b87fed37f (\"percpu: implmeent pcpu_nr_empty_pop_pages and\nchunk->nr_populated\") added pcpu_nr_empty_pop_pages and caused the\naccounting issue."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/percpu-km.c"
                    ],
                    "versions": [
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "5f43d2c1bea280dcdfabaf156c25e7402fb8039f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "92c43ac3c2b09eb16162e8144e73c00b7c3e29d6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "6fc7da2a052f2825fff785e860e67183f5acaaba",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "01504da375f5b19df195cb1cb1cf1dd184318f97",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "a6940b84c8c035da465b7165fdfcfb005545724e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "32134cf9211b83bed9076d0739c5906fbea4c763",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "5c7fc39bf19abb38a996aaad77b3e3a8f48581c3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
                            "lessThan": "89b1b79c308818a715e75f28744b70d8940a07c9",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/percpu-km.c"
                    ],
                    "versions": [
                        {
                            "version": "3.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.265",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.216",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.183",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.151",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.103",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.44",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.8",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "3.18",
                                    "versionEndExcluding": "5.10.265"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.18",
                                    "versionEndExcluding": "5.15.216"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                },
                                {
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                                    "versionStartIncluding": "3.18",
                                    "versionEndExcluding": "7.2"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5f43d2c1bea280dcdfabaf156c25e7402fb8039f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/92c43ac3c2b09eb16162e8144e73c00b7c3e29d6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6fc7da2a052f2825fff785e860e67183f5acaaba"
                },
                {
                    "url": "https://git.kernel.org/stable/c/01504da375f5b19df195cb1cb1cf1dd184318f97"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a6940b84c8c035da465b7165fdfcfb005545724e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/32134cf9211b83bed9076d0739c5906fbea4c763"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5c7fc39bf19abb38a996aaad77b3e3a8f48581c3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/89b1b79c308818a715e75f28744b70d8940a07c9"
                }
            ],
            "title": "mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()",
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}