CVE-2026-43380 (GCVE-0-2026-43380)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-08 14:21
VLAI?
Title
hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < a0fc1b9c738fba231f190ab960c83202722efee5 (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < c59090c50f62a17129fc4c5407bc4071305a9e82 (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < 52db5ef163c96f916d424e472fb17aadc35a9f7a (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < 73a7a345816946d276ad2c46c8bb771de67cfc46 (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < 24a7b9daa103fa963b3fd37d8805b23e01621976 (git)
Affected: d014538aa38561cd24c5eb228223585f26c5ec71 , < 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 (git)
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    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses \u0027data\u0027 as the destination and \u0027data_char\u0027 as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since \u0027data\u0027 is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized \u0027data_char\u0027 and writing to \u0027data\u0027, resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding \u0027data_char\u0027 to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call."
        }
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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