Allocation of Resources Without Limits or Throttling Affecting kernel-64kb-devel package, versions <6.4.0-150600.23.17.1

Note: Versions mentioned in the description apply only to the upstream kernel-64kb-devel package and not the kernel-64kb-devel package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

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.

• https://www.suse.com/security/cve/CVE-2024-39482.html
• https://bugzilla.suse.com/1227447
• https://git.kernel.org/stable/c/0c31344e22dd8d6b1394c6e4c41d639015bdc671
• https://git.kernel.org/stable/c/2c3d7b03b658dc8bfa6112b194b67b92a87e081b
• https://git.kernel.org/stable/c/3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31
• https://git.kernel.org/stable/c/5a1922adc5798b7ec894cd3f197afb6f9591b023
• https://git.kernel.org/stable/c/6479b9f41583b013041943c4602e1ad61cec8148
• https://git.kernel.org/stable/c/934e1e4331859183a861f396d7dfaf33cb5afb02