CVE-2024-49983

/// Technical description

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

ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free

When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),

the 'ppath' is updated but it is the 'path' that is freed, thus potentially

triggering a double-free in the following process:

ext4_ext_replay_update_ex

ppath = path

ext4_force_split_extent_at(&ppath)

ext4_split_extent_at

ext4_ext_insert_extent

ext4_ext_create_new_leaf

ext4_ext_grow_indepth

ext4_find_extent

if (depth > path[0].p_maxdepth)

kfree(path) ---> path First freed

*orig_path = path = NULL ---> null ppath

kfree(path) ---> path double-free !!!

So drop the unnecessary ppath and use path directly to avoid this problem.

And use ext4_find_extent() directly to update path, avoiding unnecessary

memory allocation and freeing. Also, pro

/// 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