CVE-2024-39482: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.

Affected products

• Linux Linux Kernel: from 5.10, before 5.10.221 (fixed in 5.10.221); from 5.15, before 5.15.162 (fixed in 5.15.162); from 6.1, before 6.1.94 (fixed in 6.1.94); from 6.6, before 6.6.34 (fixed in 6.6.34); from 6.9, before 6.9.5 (fixed in 6.9.5)

Published 2024-07-05. Last modified 2026-08-04.