ocfs2: validate inline data i_size during inode read_CVE-2026-43076

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate inline data i_size during inode read\n\nWhen reading an inode from disk, ocfs2_validate_inode_block() performs\nvarious sanity checks but does not validate the size of inline data.  If\nthe filesystem is corrupted, an inode's i_size can exceed the actual\ninline data capacity (id_count).\n\nThis causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data\nbuffer, triggering a use-after-free when accessing directory entries from\nfreed memory.\n\nIn the syzbot report:\n  - i_size was 1099511627576 bytes (~1TB)\n  - Actual inline data capacity (id_count) is typically <256 bytes\n  - A garbage rec_len (54648) caused ctx->pos to jump out of bounds\n  - This triggered a UAF in ocfs2_check_dir_entry()\n\nFix by adding a validation check in ocfs2_validate_inode_block() to ensure\ninodes with inline data have i_size <= id_count.  This catches the\ncorruption early during inode read and prevents all downstream code from\noperating on invalid data.",
    "published": "2026-05-06T07:40:13.634Z",
    "modified": "2026-05-08T12:40:24.482Z",
    "type": "cve",
    "title": "ocfs2: validate inline data i_size during inode read",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63\nhttps://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b\nhttps://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39\nhttps://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc\nhttps://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f",
    "id": "CVE-2026-43076",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 23193e513d1cd69411469f028d56fd175d4a6b07\nLinux Linux 23193e513d1cd69411469f028d56fd175d4a6b07\nLinux Linux 23193e513d1cd69411469f028d56fd175d4a6b07\nLinux Linux 23193e513d1cd69411469f028d56fd175d4a6b07\nLinux Linux 23193e513d1cd69411469f028d56fd175d4a6b07\nLinux Linux 2.6.24",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "23193e513d1cd69411469f028d56fd175d4a6b07",
    "vendor": "Linux",
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    "ai_score": 0
}