ocfs2: fix out-of-bounds write in ocfs2_write_end_inline_CVE-2026-43075

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\n\nKASAN reports a use-after-free write of 4086 bytes in\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\na loop device.  The actual bug is an out-of-bounds write past the inode\nblock buffer, not a true use-after-free.  The write overflows into an\nadjacent freed page, which KASAN reports as UAF.\n\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\nid_count field to determine whether a write fits in inline data.  On a\ncorrupted filesystem, id_count can exceed the physical maximum inline data\ncapacity, causing writes to overflow the inode block buffer.\n\nCall trace (crash path):\n\n   vfs_copy_file_range (fs/read_write.c:1634)\n     do_splice_direct\n       splice_direct_to_actor\n         iter_file_splice_write\n           ocfs2_file_write_iter\n             generic_perform_write\n               ocfs2_write_end\n                 ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\n                   ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\n                     memcpy_from_folio     <-- KASAN: write OOB\n\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\nalongside the existing i_size check to fix it.",
    "published": "2026-05-06T07:40:03.337Z",
    "modified": "2026-05-08T12:40:23.336Z",
    "type": "cve",
    "title": "ocfs2: fix out-of-bounds write in ocfs2_write_end_inline",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f\nhttps://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9\nhttps://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9\nhttps://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604\nhttps://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14",
    "id": "CVE-2026-43075",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 1afc32b952335f665327a1a9001ba1b44bb76fd9\nLinux Linux 1afc32b952335f665327a1a9001ba1b44bb76fd9\nLinux Linux 1afc32b952335f665327a1a9001ba1b44bb76fd9\nLinux Linux 1afc32b952335f665327a1a9001ba1b44bb76fd9\nLinux Linux 1afc32b952335f665327a1a9001ba1b44bb76fd9\nLinux Linux 2.6.24",
    "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,
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "1afc32b952335f665327a1a9001ba1b44bb76fd9",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_score": 0
}