CVE-2024-39482: bcache: fix variable length array abuse in btree_iter
First published: Fri Jul 05 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.10<5.10.221 | |
| Linux Linux kernel | >=5.15<5.15.162 | |
| Linux Linux kernel | >=6.1<6.1.94 | |
| Linux Linux kernel | >=6.6<6.6.34 | |
| Linux Linux kernel | >=6.9<6.9.5 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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Reference Links
- 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
- https://git.kernel.org/linus/3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31
- https://security-tracker.debian.org/tracker/CVE-2024-39482
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39482
- https://nvd.nist.gov/vuln/detail/CVE-2024-39482
- https://launchpad.net/bugs/cve/CVE-2024-39482
- https://ubuntu.com/security/CVE-2024-39482
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