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high7.8

CVE-2024-39482

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: eithe…

Impact

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

VendorProductAffected versions
LinuxLinux Kernel
from 5.10 before 5.10.221
from 5.15 before 5.15.162
from 6.1 before 6.1.94
from 6.6 before 6.6.34
from 6.9 before 6.9.5

Weakness classification

CWE-770

References