bpf: Fix OOB in pcpu_init_value_CVE-2026-53076

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size that is not rounded up to 8 bytes.\n\nThe issue happens when:\n1. A CGROUP_STORAGE map is created with value_size not aligned to\n   8 bytes (e.g., 4 bytes)\n2. A pcpu map is created with the same value_size (e.g., 4 bytes)\n3. Update element in 2 with data in 1\n\npcpu_init_value assumes that all sources are rounded up to 8 bytes,\nand invokes copy_map_value_long to make a data copy, However, the\nassumption doesn't stand since there are some cases where the source\nmay not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data.\nthe verifier verifies exactly the size that the source claims, not\nthe size rounded up to 8 bytes by kernel, an OOB happens when the\nsource has only 4 bytes while the copy size(4) is rounded up to 8.",
    "published": "2026-06-24T16:30:17.092Z",
    "modified": "2026-06-28T06:39:01.404Z",
    "type": "cve",
    "title": "bpf: Fix OOB in pcpu_init_value",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9\nhttps://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e\nhttps://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c\nhttps://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c\nhttps://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36",
    "id": "CVE-2026-53076",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux d3bec0138bfbe58606fc1d6f57a4cdc1a20218db\nLinux Linux d3bec0138bfbe58606fc1d6f57a4cdc1a20218db\nLinux Linux d3bec0138bfbe58606fc1d6f57a4cdc1a20218db\nLinux Linux d3bec0138bfbe58606fc1d6f57a4cdc1a20218db\nLinux Linux d3bec0138bfbe58606fc1d6f57a4cdc1a20218db\nLinux Linux c602ad2b52dcbca5af08e5137bd5575c039b52e3\nLinux Linux ab68b940dd6f7b5f8e2557937162dcb8a0583a05\nLinux Linux 5.4.78\nLinux Linux 5.9.9\nLinux Linux 5.10",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}