CVE-2026-74350

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: validate fast symlink target during inode read

ocfs2_validate_inode_block() already rejects several inconsistent

self-contained dinodes before they are exposed to the rest of the

filesystem. Fast symlinks need the same treatment.

A zero-cluster symlink is treated as a fast symlink and later read through

page_get_link() and ocfs2_fast_symlink_read_folio(). That path uses

strnlen() on the inline payload and then copies len + 1 bytes into the

folio. If a corrupt dinode stores an i_size that does not fit the inline

area or omits the terminating NUL at i_size, that copy reads past the end

of the inode block buffer.

Reject zero-cluster symlink dinodes whose i_size exceeds the inline

fast-symlink capacity or whose inline payload is not NUL-terminated

exactly at i_size when the inode block is validated. This keeps malformed

fast symlinks from reaching the read path.

Validation reproduced this kernel report:

KAS

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References