CVE-2026-64501

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iio/adc/ad_sigma_delta.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c313bb7c38855e94ceef939d152dd75e5a904b5f", "status": "affected", "version": "132d44dc6966c1cf841ffe0f6f048165687e870b", "versionType": "git"}, {"lessThan": "f1de829ee87a1198d3465493ce430d36c5fa029c", "status": "affected", "version": "132d44dc6966c1cf841ffe0f6f048165687e870b", "versionType": "git"}, {"lessThan": "c72da0688575e5ef39c36bb44fed53aa18f8ae65", "status": "affected", "version": "132d44dc6966c1cf841ffe0f6f048165687e870b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iio/adc/ad_sigma_delta.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-64501", "lastModified": "2026-11-03T18:15:39.353", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:36.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c313bb7c38855e94ceef939d152dd75e5a904b5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c72da0688575e5ef39c36bb44fed53aa18f8ae65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1de829ee87a1198d3465493ce430d36c5fa029c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: iio: adc: ad_sigma_delta: fix CS held asserted and state leaks", "id": "2507115", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507115"}, "csaw": false, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's `ad_sigma_delta` driver for analog-to-digital converters (ADCs). This vulnerability occurs when the Chip Select (CS) line, which controls communication with the ADC, remains asserted after a conversion or in an error state. This can prevent other devices on the Serial Peripheral Interface (SPI) bus from communicating, leading to a denial of service. Additionally, improper handling of the bus lock can allow concurrent access to the SPI bus, potentially causing system instability."], "name": "CVE-2026-64501", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64501\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64501\nhttps://lore.kernel.org/linux-cve-announce/2026072552-CVE-2026-64501-b29a@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[132d44dc6966c1cf841ffe0f6f048165687e870b,c313bb7c38855e94ceef939d152dd75e5a904b5f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[132d44dc6966c1cf841ffe0f6f048165687e870b,f1de829ee87a1198d3465493ce430d36c5fa029c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[132d44dc6966c1cf841ffe0f6f048165687e870b,c72da0688575e5ef39c36bb44fed53aa18f8ae65)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-26T01:00:04.300735+00:00", "updated": "2026-08-02T12:30:05.797064+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}