UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
50 explicit affected versions
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19 explicit affected versions
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2 explicit affected versions
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7 explicit affected versions
12 explicit affected versions
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3 explicit affected versions
37 explicit affected versions
13 explicit affected versions
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13 explicit affected versions
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23 explicit affected versions
10 explicit affected versions
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7 explicit affected versions
12 explicit affected versions
10 explicit affected versions
26 explicit affected versions
9 explicit affected versions
2 explicit affected versions
10 explicit affected versions
13 explicit affected versions
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16 explicit affected versions
10 explicit affected versions
3 explicit affected versions
51 explicit affected versions
7 explicit affected versions
12 explicit affected versions
27 explicit affected versions
3 explicit affected versions
8 explicit affected versions
5 explicit affected versions
8 explicit affected versions
10 explicit affected versions
6 explicit affected versions
13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
12 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
10 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
2 explicit affected versions
7 explicit affected versions
4 explicit affected versions
13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
5 explicit affected versions
14 explicit affected versions
4 explicit affected versions
11 explicit affected versions
1 explicit affected versions
3 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31
- 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://lore.kernel.org/all/[email protected]/
- https://ubuntu.com/security/CVE-2024-39482
- https://ubuntu.com/security/notices/USN-6949-1
- https://ubuntu.com/security/notices/USN-6949-2
- https://ubuntu.com/security/notices/USN-6952-1
- https://ubuntu.com/security/notices/USN-6952-2
- https://ubuntu.com/security/notices/USN-6955-1
- https://ubuntu.com/security/notices/USN-7007-1
- https://ubuntu.com/security/notices/USN-7007-2
- https://ubuntu.com/security/notices/USN-7007-3
- https://ubuntu.com/security/notices/USN-7009-1
- https://ubuntu.com/security/notices/USN-7009-2
- https://ubuntu.com/security/notices/USN-7019-1
- https://www.cve.org/CVERecord?id=CVE-2024-39482