CVE-2026-64501
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the ad_sigma_delta ADC driver in the Linux kernel, issues were found with CS (chip select) being left asserted and SPI bus lock state leaks. In ad_sigma_delta_single_conversion(), set_mode() and disable_one() are called while keep_cs_asserted is still true, leaving CS active after conversion. Additionally, in the error path of ad_sd_buffer_postenable(), the device may remain in continuous conversion mode with CS asserted, and the bus_locked flag may stay set, allowing concurrent SPI access.
Risk Assessment
Improper CS and bus lock management can cause SPI communication disruptions, data read errors, and potential hardware damage in multi-master systems.
Recommendation
Apply the Linux kernel patch that moves set_mode() and disable_one() calls after clearing keep_cs_asserted and fixes the error path in ad_sd_buffer_postenable().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad_sigma_delta: fix CS held asserted and state leaks In ad_sigma_delta_single_conversion(), set_mode(AD_SD_MODE_IDLE) and disable_one() were called from the out: block while keep_cs_asserted was still true. This caused any SPI transfer issued by those callbacks to carry cs_change=1, leaving CS permanently asserted after the conversion. Fix by moving both calls into the out_unlock: block, after keep_cs_asserted is cleared, matching the pattern already used in ad_sd_calibrate(). In the error path of ad_sd_buffer_postenable(), if an operation fails after set_mode(AD_SD_MODE_CONTINUOUS) has already succeeded (e.g. spi_offload_trigger_enable()), the device is left in continuous conversion mode with CS physically asserted. Additionally, bus_locked remaining true after spi_bus_unlock() causes subsequent SPI operations to call spi_sync_locked() without the bus lock actually held, allowing concurrent SPI access. Fix the error path by clearing keep_cs_asserted first, then calling set_mode(AD_SD_MODE_IDLE) to revert the device mode and deassert CS, then clearing bus_locked before releasing the bus. For devices that implement neither set_mode nor disable_one (such as MAX11205, which has no physical CS pin), no SPI transfer is issued during cleanup and the cs_change flag has no effect on any physical line.