CVE-2024-39482

MEDIUM
Published Jul 5, 2024 Modified May 12, 2026 CWE-770

Description

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

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/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

Frequently Asked Questions

What is 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: 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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-39482? +
CVE-2024-39482 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-39482? +
CVE-2024-39482 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-39482? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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