CVE-2026-43380

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Source
https://cve.org/CVERecord?id=CVE-2026-43380
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43380.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-43380
Downstream
Related
Published
2026-05-08T14:21:28Z
Modified
2026-08-27T18:26:53Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read
Details

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.
Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43380.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
d014538aa38561cd24c5eb228223585f26c5ec71
Fixed
a0fc1b9c738fba231f190ab960c83202722efee5
Fixed
c59090c50f62a17129fc4c5407bc4071305a9e82
Fixed
52db5ef163c96f916d424e472fb17aadc35a9f7a
Fixed
b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b
Fixed
73a7a345816946d276ad2c46c8bb771de67cfc46
Fixed
24a7b9daa103fa963b3fd37d8805b23e01621976
Fixed
25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43380.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.203
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.167
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.130
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.78
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.19
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43380.json"