CVE-2026-43076 (GCVE-0-2026-43076)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
ocfs2: validate inline data i_size during inode read
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline data i_size during inode read When reading an inode from disk, ocfs2_validate_inode_block() performs various sanity checks but does not validate the size of inline data. If the filesystem is corrupted, an inode's i_size can exceed the actual inline data capacity (id_count). This causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data buffer, triggering a use-after-free when accessing directory entries from freed memory. In the syzbot report: - i_size was 1099511627576 bytes (~1TB) - Actual inline data capacity (id_count) is typically <256 bytes - A garbage rec_len (54648) caused ctx->pos to jump out of bounds - This triggered a UAF in ocfs2_check_dir_entry() Fix by adding a validation check in ocfs2_validate_inode_block() to ensure inodes with inline data have i_size <= id_count. This catches the corruption early during inode read and prevents all downstream code from operating on invalid data.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37f074e65f24f10f8d8df224a572e4cb9e6faf63 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cd2d765aa7157f852999842af32148128c735d39 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 77d0295725109d77f5854ef5b58c0d06c08168cc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1524af3685b35feac76662cc551cbc37bd14775f (git)
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    Linux Linux Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/ocfs2/inode.c"
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          "value": "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\u0027s 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 \u003c256 bytes\n  - A garbage rec_len (54648) caused ctx-\u003epos 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 \u003c= id_count.  This catches the\ncorruption early during inode read and prevents all downstream code from\noperating on invalid data."
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      "providerMetadata": {
        "dateUpdated": "2026-05-06T07:40:13.634Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f"
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      ],
      "title": "ocfs2: validate inline data i_size during inode read",
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    "cveId": "CVE-2026-43076",
    "datePublished": "2026-05-06T07:40:13.634Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-06T07:40:13.634Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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