CVE-2026-31449

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code. A flaw was found in the Linux kernel’s ext4 filesystem. A local attacker could exploit this vulnerability by providing a specially crafted or corrupted on-disk extent header. This could cause an out-of-bounds read in memory, potentially leading to information disclosure or a system crash (Denial of Service).

Live-patch status from KernelCare for each operating system.