zram: fix use-after-free in zram_bvec_write_partial()_CVE-2026-53185

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix use-after-free in zram_bvec_write_partial()\n\nzram_read_page() picks the sync or async backing device read path based on\nwhether the parent bio is NULL.  zram_bvec_write_partial() passes its\nparent bio down, so for ZRAM_WB slots the read is dispatched\nasynchronously and zram_read_page() returns 0 while the bio is still in\nflight.  The caller then runs memcpy_from_bvec(), zram_write_page() and\n__free_page() on the buffer, leaving the async read to write into a freed\npage.\n\nzram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d\n(\"zram: fix synchronous reads\") for the same reason; the write_partial\ncounterpart was missed.",
    "published": "2026-06-25T08:38:58.853Z",
    "modified": "2026-06-28T06:39:59.910Z",
    "type": "cve",
    "title": "zram: fix use-after-free in zram_bvec_write_partial()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a\nhttps://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64\nhttps://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b\nhttps://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb\nhttps://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0",
    "id": "CVE-2026-53185",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8e654f8fbff52ac483fb69957222853d7e2fc588\nLinux Linux 8e654f8fbff52ac483fb69957222853d7e2fc588\nLinux Linux 8e654f8fbff52ac483fb69957222853d7e2fc588\nLinux Linux 8e654f8fbff52ac483fb69957222853d7e2fc588\nLinux Linux 8e654f8fbff52ac483fb69957222853d7e2fc588\nLinux Linux 4.14",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8e654f8fbff52ac483fb69957222853d7e2fc588",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_vendor": "",
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    "ai_version": "",
    "ai_score": 0
}