{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64501","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.793Z","datePublished":"2026-07-25T08:51:56.768Z","dateUpdated":"2026-08-17T04:56:51.067Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:56:51.067Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad_sigma_delta: fix CS held asserted and state leaks\n\nIn ad_sigma_delta_single_conversion(), set_mode(AD_SD_MODE_IDLE) and\ndisable_one() were called from the out: block while keep_cs_asserted\nwas still true. This caused any SPI transfer issued by those callbacks\nto carry cs_change=1, leaving CS permanently asserted after the\nconversion. Fix by moving both calls into the out_unlock: block, after\nkeep_cs_asserted is cleared, matching the pattern already used in\nad_sd_calibrate().\n\nIn the error path of ad_sd_buffer_postenable(), if an operation fails\nafter set_mode(AD_SD_MODE_CONTINUOUS) has already succeeded (e.g.\nspi_offload_trigger_enable()), the device is left in continuous\nconversion mode with CS physically asserted. Additionally,\nbus_locked remaining true after spi_bus_unlock() causes subsequent\nSPI operations to call spi_sync_locked() without the bus lock actually\nheld, allowing concurrent SPI access.\n\nFix the error path by clearing keep_cs_asserted first, then calling\nset_mode(AD_SD_MODE_IDLE) to revert the device mode and deassert CS,\nthen clearing bus_locked before releasing the bus.\n\nFor devices that implement neither set_mode nor disable_one (such as\nMAX11205, which has no physical CS pin), no SPI transfer is issued\nduring cleanup and the cs_change flag has no effect on any physical\nline."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - An attacker reaches the vulnerable conversion path through local reads of IIO `*_raw` sysfs attributes; physical access to the installed ADC is unnecessary.\nAC:L - The normal single-conversion cleanup deterministically leaves CS asserted, and the attacker can repeat the trigger or interrupt their own conversion wait without winning a race.\nPR:L - IIO raw attributes are world-readable and the path contains no capability or authentication check, so an ordinary unprivileged local user can trigger it.\nUI:N - The attacker directly reads the sysfs attribute or initiates permitted device access; no victim action is required.\nS:U - The affected ADC, SPI controller, shared-bus devices, and kernel operate under the same system security authority; this is not a sandbox or virtualization boundary escape.\nC:N - The state corruption creates no kernel-memory disclosure or unauthorized read primitive; the separate heap-overflow issue in CVE-2026-64502 is not part of this CVE.\nI:H - With CS stuck active, attacker-influenced traffic for another shared-bus device can be consumed as commands by register-based ADCs, including writes to mode, channel, offset, and gain registers that can completely corrupt measurement integrity.\nA:H - The persistently selected ADC can contend on MISO, consume sibling-device traffic, and leave the ADC or shared SPI bus unusable until reset or corrective access; an unprivileged attacker can repeatedly restore this condition."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"],"versions":[{"version":"132d44dc6966c1cf841ffe0f6f048165687e870b","lessThan":"c313bb7c38855e94ceef939d152dd75e5a904b5f","status":"affected","versionType":"git"},{"version":"132d44dc6966c1cf841ffe0f6f048165687e870b","lessThan":"f1de829ee87a1198d3465493ce430d36c5fa029c","status":"affected","versionType":"git"},{"version":"132d44dc6966c1cf841ffe0f6f048165687e870b","lessThan":"c72da0688575e5ef39c36bb44fed53aa18f8ae65","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c313bb7c38855e94ceef939d152dd75e5a904b5f"},{"url":"https://git.kernel.org/stable/c/f1de829ee87a1198d3465493ce430d36c5fa029c"},{"url":"https://git.kernel.org/stable/c/c72da0688575e5ef39c36bb44fed53aa18f8ae65"}],"title":"iio: adc: ad_sigma_delta: fix CS held asserted and state leaks","x_generator":{"engine":"bippy-1.2.0"}}}}