CVE-2026-43380hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 96% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < a0fc1b9c738fba231f190ab960c83202722efee5
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < c59090c50f62a17129fc4c5407bc4071305a9e82
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < 52db5ef163c96f916d424e472fb17aadc35a9f7a
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < 73a7a345816946d276ad2c46c8bb771de67cfc46
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < 24a7b9daa103fa963b3fd37d8805b23e01621976
- affected d014538aa38561cd24c5eb228223585f26c5ec71 – < 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43
- affected 5.11
- unaffected < 5.11
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References7
- https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5 (opens in a new tab)
- https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82 (opens in a new tab)
- https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a (opens in a new tab)
- https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b (opens in a new tab)
- https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46 (opens in a new tab)
- https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976 (opens in a new tab)
- https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28686 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43380)Record last updated .