CVE-2026-43380hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read
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In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source. Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack. Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read. Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d014538aa38561cd24c5eb228223585f26c5ec71 before a0fc1b9c738fba231f190ab960c83202722efee5; from d014538aa38561cd24c5eb228223585f26c5ec71 before c59090c50f62a17129fc4c5407bc4071305a9e82; from d014538aa38561cd24c5eb228223585f26c5ec71 before 52db5ef163c96f916d424e472fb17aadc35a9f7a; from d014538aa38561cd24c5eb228223585f26c5ec71 before b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b; from d014538aa38561cd24c5eb228223585f26c5ec71 before 73a7a345816946d276ad2c46c8bb771de67cfc46; from d014538aa38561cd24c5eb228223585f26c5ec71 before 24a7b9daa103fa963b3fd37d8805b23e01621976; from d014538aa38561cd24c5eb228223585f26c5ec71 before 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5patch
- https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82patch
- https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7apatch
- https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120bpatch
- https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46patch
- https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976patch
- https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.