CVE-2026-43076
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/131c0b573e1b467b7d553e9ff38003f1acd8f5f2
- https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775fPatch
- https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63Patch
- https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168ccPatch
- https://git.kernel.org/stable/c/bcd46bc261b215b3b12c557a978299eafa02ecdd
- https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1bPatch
- https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39Patch
- https://git.kernel.org/stable/c/d012c782abcabe68b5b9e71be58a15e9f9d83dc1
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.