Vulnerability-Lookup

CVE-2026-64502 (GCVE-0-2026-64502)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

iio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices ad_sigma_delta_clear_pending_event() falls through to the status register read path for devices with has_registers = false and no rdy_gpiod. For such devices, ad_sd_read_reg() skips the address byte entirely and clocks raw MISO bytes with no address phase — making it byte-for-byte identical to reading conversion data. If a pending conversion result is present, this partially consumes it and corrupts the data stream for the subsequent ad_sd_read_reg() call in ad_sigma_delta_single_conversion(). Furthermore, with num_resetclks = 0 on these devices, data_read_len evaluates to 0. If the clocked byte has bit 7 clear, pending_event is set and the code attempts memset(data + 2, 0xff, 0 - 1), overflowing to SIZE_MAX and corrupting the heap. Fix by returning 0 immediately when neither rdy_gpiod nor has_registers is set. This is safe for all current registerless devices: ad7191 and ad7780 (with powerdown GPIO) are reset between conversions by CS deassertion, so there is no stale result to drain; ad7780 (without powerdown GPIO) and max11205 are continuously-converting and cycle ~DRDY at the output data rate regardless of whether the previous result was read, so the next falling edge fires naturally. A future registerless device that holds ~DRDY asserted until data is read would be broken by this early return and would require either num_resetclks set or a rdy-gpio. The same heap corruption is reachable on any device with rdy_gpiod set but num_resetclks = 0: if the GPIO indicates a pending event, the drain path executes memset(data + 2, 0xff, 0 - 1) regardless of has_registers. Add an explicit data_read_len == 0 guard after the pending event check; the stale result is then consumed by the first ad_sd_read_reg() call in ad_sigma_delta_single_conversion().

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/3394e0b3328422431…
https://git.kernel.org/stable/c/3bceb26dfaf7ba805…
https://git.kernel.org/stable/c/91bc6767a4f55dc47…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 132d44dc6966c1cf841ffe0f6f048165687e870b , < 3394e0b3328422431cadaf314fa58d3717ed4936 (git) Affected: 132d44dc6966c1cf841ffe0f6f048165687e870b , < 3bceb26dfaf7ba805b459e41c1d0ba916862dade (git) Affected: 132d44dc6966c1cf841ffe0f6f048165687e870b , < 91bc6767a4f55dc470d8a56b55b9f2ea09094efe (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/iio/adc/ad_sigma_delta.c"
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            },
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          "versions": [
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              "version": "6.14"
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              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
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              "version": "7.1.4",
              "versionType": "semver"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices\n\nad_sigma_delta_clear_pending_event() falls through to the status register\nread path for devices with has_registers = false and no rdy_gpiod. For\nsuch devices, ad_sd_read_reg() skips the address byte entirely and clocks\nraw MISO bytes with no address phase \u2014 making it byte-for-byte identical\nto reading conversion data. If a pending conversion result is present,\nthis partially consumes it and corrupts the data stream for the subsequent\nad_sd_read_reg() call in ad_sigma_delta_single_conversion().\n\nFurthermore, with num_resetclks = 0 on these devices, data_read_len\nevaluates to 0. If the clocked byte has bit 7 clear, pending_event is set\nand the code attempts memset(data + 2, 0xff, 0 - 1), overflowing to\nSIZE_MAX and corrupting the heap.\n\nFix by returning 0 immediately when neither rdy_gpiod nor has_registers\nis set. This is safe for all current registerless devices: ad7191 and\nad7780 (with powerdown GPIO) are reset between conversions by CS\ndeassertion, so there is no stale result to drain; ad7780 (without\npowerdown GPIO) and max11205 are continuously-converting and cycle ~DRDY\nat the output data rate regardless of whether the previous result was\nread, so the next falling edge fires naturally.\n\nA future registerless device that holds ~DRDY asserted until data is read\nwould be broken by this early return and would require either\nnum_resetclks set or a rdy-gpio.\n\nThe same heap corruption is reachable on any device with rdy_gpiod set\nbut num_resetclks = 0: if the GPIO indicates a pending event, the drain\npath executes memset(data + 2, 0xff, 0 - 1) regardless of has_registers.\nAdd an explicit data_read_len == 0 guard after the pending event check;\nthe stale result is then consumed by the first ad_sd_read_reg() call in\nad_sigma_delta_single_conversion()."
        }
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          "url": "https://git.kernel.org/stable/c/3bceb26dfaf7ba805b459e41c1d0ba916862dade"
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        {
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      ],
      "title": "iio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices",
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    "cveId": "CVE-2026-64502",
    "datePublished": "2026-07-25T08:51:57.477Z",
    "dateReserved": "2026-07-19T15:36:31.793Z",
    "dateUpdated": "2026-07-25T08:51:57.477Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64502\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:36.200\",\"lastModified\":\"2026-07-25T10:17:36.200\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices\\n\\nad_sigma_delta_clear_pending_event() falls through to the status register\\nread path for devices with has_registers = false and no rdy_gpiod. For\\nsuch devices, ad_sd_read_reg() skips the address byte entirely and clocks\\nraw MISO bytes with no address phase \u2014 making it byte-for-byte identical\\nto reading conversion data. If a pending conversion result is present,\\nthis partially consumes it and corrupts the data stream for the subsequent\\nad_sd_read_reg() call in ad_sigma_delta_single_conversion().\\n\\nFurthermore, with num_resetclks = 0 on these devices, data_read_len\\nevaluates to 0. If the clocked byte has bit 7 clear, pending_event is set\\nand the code attempts memset(data + 2, 0xff, 0 - 1), overflowing to\\nSIZE_MAX and corrupting the heap.\\n\\nFix by returning 0 immediately when neither rdy_gpiod nor has_registers\\nis set. This is safe for all current registerless devices: ad7191 and\\nad7780 (with powerdown GPIO) are reset between conversions by CS\\ndeassertion, so there is no stale result to drain; ad7780 (without\\npowerdown GPIO) and max11205 are continuously-converting and cycle ~DRDY\\nat the output data rate regardless of whether the previous result was\\nread, so the next falling edge fires naturally.\\n\\nA future registerless device that holds ~DRDY asserted until data is read\\nwould be broken by this early return and would require either\\nnum_resetclks set or a rdy-gpio.\\n\\nThe same heap corruption is reachable on any device with rdy_gpiod set\\nbut num_resetclks = 0: if the GPIO indicates a pending event, the drain\\npath executes memset(data + 2, 0xff, 0 - 1) regardless of has_registers.\\nAdd an explicit data_read_len == 0 guard after the pending event check;\\nthe stale result is then consumed by the first ad_sd_read_reg() call in\\nad_sigma_delta_single_conversion().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/iio/adc/ad_sigma_delta.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"132d44dc6966c1cf841ffe0f6f048165687e870b\",\"lessThan\":\"3394e0b3328422431cadaf314fa58d3717ed4936\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"132d44dc6966c1cf841ffe0f6f048165687e870b\",\"lessThan\":\"3bceb26dfaf7ba805b459e41c1d0ba916862dade\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"132d44dc6966c1cf841ffe0f6f048165687e870b\",\"lessThan\":\"91bc6767a4f55dc470d8a56b55b9f2ea09094efe\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/iio/adc/ad_sigma_delta.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3394e0b3328422431cadaf314fa58d3717ed4936\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3bceb26dfaf7ba805b459e41c1d0ba916862dade\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91bc6767a4f55dc470d8a56b55b9f2ea09094efe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

GHSA-2VPQ-89RM-WM52

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

iio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices

ad_sigma_delta_clear_pending_event() falls through to the status register read path for devices with has_registers = false and no rdy_gpiod. For such devices, ad_sd_read_reg() skips the address byte entirely and clocks raw MISO bytes with no address phase — making it byte-for-byte identical to reading conversion data. If a pending conversion result is present, this partially consumes it and corrupts the data stream for the subsequent ad_sd_read_reg() call in ad_sigma_delta_single_conversion().

Furthermore, with num_resetclks = 0 on these devices, data_read_len evaluates to 0. If the clocked byte has bit 7 clear, pending_event is set and the code attempts memset(data + 2, 0xff, 0 - 1), overflowing to SIZE_MAX and corrupting the heap.

Fix by returning 0 immediately when neither rdy_gpiod nor has_registers is set. This is safe for all current registerless devices: ad7191 and ad7780 (with powerdown GPIO) are reset between conversions by CS deassertion, so there is no stale result to drain; ad7780 (without powerdown GPIO) and max11205 are continuously-converting and cycle ~DRDY at the output data rate regardless of whether the previous result was read, so the next falling edge fires naturally.

A future registerless device that holds ~DRDY asserted until data is read would be broken by this early return and would require either num_resetclks set or a rdy-gpio.

The same heap corruption is reachable on any device with rdy_gpiod set but num_resetclks = 0: if the GPIO indicates a pending event, the drain path executes memset(data + 2, 0xff, 0 - 1) regardless of has_registers. Add an explicit data_read_len == 0 guard after the pending event check; the stale result is then consumed by the first ad_sd_read_reg() call in ad_sigma_delta_single_conversion().

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64502"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad_sigma_delta: fix clear_pending_event for registerless devices\n\nad_sigma_delta_clear_pending_event() falls through to the status register\nread path for devices with has_registers = false and no rdy_gpiod. For\nsuch devices, ad_sd_read_reg() skips the address byte entirely and clocks\nraw MISO bytes with no address phase \u2014 making it byte-for-byte identical\nto reading conversion data. If a pending conversion result is present,\nthis partially consumes it and corrupts the data stream for the subsequent\nad_sd_read_reg() call in ad_sigma_delta_single_conversion().\n\nFurthermore, with num_resetclks = 0 on these devices, data_read_len\nevaluates to 0. If the clocked byte has bit 7 clear, pending_event is set\nand the code attempts memset(data + 2, 0xff, 0 - 1), overflowing to\nSIZE_MAX and corrupting the heap.\n\nFix by returning 0 immediately when neither rdy_gpiod nor has_registers\nis set. This is safe for all current registerless devices: ad7191 and\nad7780 (with powerdown GPIO) are reset between conversions by CS\ndeassertion, so there is no stale result to drain; ad7780 (without\npowerdown GPIO) and max11205 are continuously-converting and cycle ~DRDY\nat the output data rate regardless of whether the previous result was\nread, so the next falling edge fires naturally.\n\nA future registerless device that holds ~DRDY asserted until data is read\nwould be broken by this early return and would require either\nnum_resetclks set or a rdy-gpio.\n\nThe same heap corruption is reachable on any device with rdy_gpiod set\nbut num_resetclks = 0: if the GPIO indicates a pending event, the drain\npath executes memset(data + 2, 0xff, 0 - 1) regardless of has_registers.\nAdd an explicit data_read_len == 0 guard after the pending event check;\nthe stale result is then consumed by the first ad_sd_read_reg() call in\nad_sigma_delta_single_conversion().",
  "id": "GHSA-2vpq-89rm-wm52",
  "modified": "2026-07-25T12:31:38Z",
  "published": "2026-07-25T12:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64502"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3394e0b3328422431cadaf314fa58d3717ed4936"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bceb26dfaf7ba805b459e41c1d0ba916862dade"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91bc6767a4f55dc470d8a56b55b9f2ea09094efe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64502 (GCVE-0-2026-64502)

GHSA-2VPQ-89RM-WM52

Tags

Sightings

Nomenclature