CVE-2026-43076 POC (Proof-of-Concept)

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.

Published: 2026-05-06

CVSS: 7.8

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Download CVE-2026-43076 POC (Proof-of-Concept) here:

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https://hokyo.gr/poc-192-cve-2026-7675/

https://hokyo.gr/poc-742-cve-2026-41902/

https://hokyo.gr/poc-359-cve-2026-43567/

https://hokyo.gr/poc-681-cve-2026-41586/

https://hokyo.gr/poc-299-cve-2026-43964/