hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read
Summary
| CVE | CVE-2026-43380 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:49 UTC |
| Updated | 2026-05-12 14:10:27 UTC |
| 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. |
Risk And Classification
EPSS: 0.000300000 probability, percentile 0.087840000 (date 2026-05-12)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 a0fc1b9c738fba231f190ab960c83202722efee5 git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 c59090c50f62a17129fc4c5407bc4071305a9e82 git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 52db5ef163c96f916d424e472fb17aadc35a9f7a git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 73a7a345816946d276ad2c46c8bb771de67cfc46 git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 24a7b9daa103fa963b3fd37d8805b23e01621976 git | Not specified |
| CNA | Linux | Linux | affected d014538aa38561cd24c5eb228223585f26c5ec71 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 git | Not specified |
| CNA | Linux | Linux | affected 5.11 | Not specified |
| CNA | Linux | Linux | unaffected 5.11 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.