bcache: fix variable length array abuse in btree_iter
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-770.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.10 and later | 5.10.221, 5.15.162, 6.1.94, 6.6.34, 6.9.5, 6.10 | Patch available | CNA |
- Linux VendorLinux Affected 3.10 and later Fixed in 5.10.221, 5.15.162, 6.1.94, 6.6.34, 6.9.5, 6.10 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.10 to before 5.10.221; 5.15 to before 5.15.162; 6.1 to before 6.1.94; 6.6 to before 6.6.34; 6.9 to before 6.9.5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.10 to before 5.10.221; 5.15 to before 5.15.162; 6.1 to before 6.1.94; 6.6 to before 6.6.34; 6.9 to before 6.9.5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.221, 5.15.162, 6.1.94, 6.6.34, 6.9.5, 6.10
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-39482
- 2026-10-03 Alias added: GHSA-rp28-w34f-g6rm
References
Patch 6
- https://git.kernel.org/stable/c/2c3d7b03b658dc8bfa6112b194b67b92a87e081b
- https://git.kernel.org/stable/c/5a1922adc5798b7ec894cd3f197afb6f9591b023
- https://git.kernel.org/stable/c/934e1e4331859183a861f396d7dfaf33cb5afb02
- https://git.kernel.org/stable/c/6479b9f41583b013041943c4602e1ad61cec8148
- https://git.kernel.org/stable/c/0c31344e22dd8d6b1394c6e4c41d639015bdc671
- https://git.kernel.org/stable/c/3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31
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Sources
- CVE-2024-39482 · CVE Program
- CVE-2024-39482 · NVD
- FIRST EPSS
- GHSA-rp28-w34f-g6rm · GitHub Advisory Database · CC BY 4.0
- CVE-2024-39482 · Red Hat security data · CC BY 4.0
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