hwmon: (ltc4282) Clamp negative current limits

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Summary

CVECVE-2026-74685
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:42 UTC
Updated2026-08-22 16:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Clamp negative current limits When a negative value is passed to ltc4282_write_curr(), the signed long val is cast directly to u64: drivers/hwmon/ltc4282.c:ltc4282_write_curr() { /* need to pass it in millivolt */ u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st->rsense, DECA * MICRO); ... } This cast converts negative inputs into large positive values. The subsequent division result overflows the u32 in variable, truncating to a pseudo-random positive value. When this is passed to ltc4282_write_voltage_byte(), it is clamped to the maximum limit instead of zero. Clamp val to 0 and to the maximum supported upper limit before the cast and assign the result to a 64-bit temporary variable before the division to avoid the underflow and an also possible overflow.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.062130000 (date 2026-08-24)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 60e06c4dba696173982393252a40ceb7dd2eec18 git Not specified
CNA Linux Linux affected cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 de58b90a4d1417c15b693eb04c0ce6bc925d84c6 git Not specified
CNA Linux Linux affected cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 046e56b53c09375ef39903514496aa5508db9729 git Not specified
CNA Linux Linux affected cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 e253dd5f9f6d875a317895bf43ec9534ed7523cb git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/60e06c4dba696173982393252a40ceb7dd2eec18 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de58b90a4d1417c15b693eb04c0ce6bc925d84c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e253dd5f9f6d875a317895bf43ec9534ed7523cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/046e56b53c09375ef39903514496aa5508db9729 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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