hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read

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Summary

CVECVE-2026-43380
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:49 UTC
Updated2026-05-20 17:16:22 UTC
DescriptionIn 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

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.000300000 probability, percentile 0.087840000 (date 2026-05-12)

Problem Types: CWE-125

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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

ReferenceSourceLinkTags
git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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