CVE-2026-64501

Technical Description

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.

F

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References