Vulnerability-Lookup

GHSA-GGVG-29PG-F22F

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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

iio: buffer: hw-consumer: fix use-after-free in error path

In the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code was using list_for_each_entry() to iterate through buffers while calling iio_buffer_put() which can free the current buffer if refcount drops to 0. The list_for_each_entry() loop macro then evaluates buf->head.next to continue iteration, accessing the freed buffer.

Fix this by using list_for_each_entry_safe().

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63930"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:11Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: hw-consumer: fix use-after-free in error path\n\nIn the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code\nwas using list_for_each_entry() to iterate through buffers while calling\niio_buffer_put() which can free the current buffer if refcount drops to 0.\nThe list_for_each_entry() loop macro then evaluates buf-\u003ehead.next to\ncontinue iteration, accessing the freed buffer.\n\nFix this by using list_for_each_entry_safe().",
  "id": "GHSA-ggvg-29pg-f22f",
  "modified": "2026-07-20T15:31:52Z",
  "published": "2026-07-19T18:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63930"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29783e6b6ec0b7152a15e53a063f17537e81177d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ff615fc455acda5425c4900160cbe11cfea4449"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9319c94f63ed10723afd738d79f5617daba87cc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3763ae33476328cf8d661742deb9daec78eac96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b71893c57730809c222766e5718bb33610f11963"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2759d49860b9a39b5cde2fb88e4b822ddf5f58f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e965627f0d442bfcae3f496c90cb653fb0917a61"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-63930 (GCVE-0-2026-63930)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37

Title

iio: buffer: hw-consumer: fix use-after-free in error path

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: buffer: hw-consumer: fix use-after-free in error path In the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code was using list_for_each_entry() to iterate through buffers while calling iio_buffer_put() which can free the current buffer if refcount drops to 0. The list_for_each_entry() loop macro then evaluates buf->head.next to continue iteration, accessing the freed buffer. Fix this by using list_for_each_entry_safe().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b71893c57730809c2…
https://git.kernel.org/stable/c/2ff615fc455acda54…
https://git.kernel.org/stable/c/d2759d49860b9a39b…
https://git.kernel.org/stable/c/29783e6b6ec0b7152…
https://git.kernel.org/stable/c/e965627f0d442bfca…
https://git.kernel.org/stable/c/a3763ae33476328cf…
https://git.kernel.org/stable/c/9319c94f63ed10723…
https://git.kernel.org/stable/c/6f5ed4f2c7c83f333…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < b71893c57730809c222766e5718bb33610f11963 (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < 2ff615fc455acda5425c4900160cbe11cfea4449 (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < d2759d49860b9a39b5cde2fb88e4b822ddf5f58f (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < 29783e6b6ec0b7152a15e53a063f17537e81177d (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < e965627f0d442bfcae3f496c90cb653fb0917a61 (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < a3763ae33476328cf8d661742deb9daec78eac96 (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < 9319c94f63ed10723afd738d79f5617daba87cc8 (git) Affected: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c , < 6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4 (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/buffer/industrialio-hw-consumer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b71893c57730809c222766e5718bb33610f11963",
              "status": "affected",
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              "versionType": "git"
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            {
              "lessThan": "2ff615fc455acda5425c4900160cbe11cfea4449",
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              "version": "48b66f8f936f369bb1a43c12aedbfeb2975baf4c",
              "versionType": "git"
            },
            {
              "lessThan": "d2759d49860b9a39b5cde2fb88e4b822ddf5f58f",
              "status": "affected",
              "version": "48b66f8f936f369bb1a43c12aedbfeb2975baf4c",
              "versionType": "git"
            },
            {
              "lessThan": "29783e6b6ec0b7152a15e53a063f17537e81177d",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "48b66f8f936f369bb1a43c12aedbfeb2975baf4c",
              "versionType": "git"
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              "version": "4.16"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "4.16",
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                {
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                  "vulnerable": true
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: hw-consumer: fix use-after-free in error path\n\nIn the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code\nwas using list_for_each_entry() to iterate through buffers while calling\niio_buffer_put() which can free the current buffer if refcount drops to 0.\nThe list_for_each_entry() loop macro then evaluates buf-\u003ehead.next to\ncontinue iteration, accessing the freed buffer.\n\nFix this by using list_for_each_entry_safe()."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The vulnerable code is only reached from kernel driver probe via `devm_iio_hw_consumer_alloc()` in the STM32 DFSDM ADC driver; there is no network, Bluetooth, or direct userspace syscall/ioctl path to `iio_hw_consumer_alloc()`.\nAC:L - Once on affected hardware, triggering the bug requires only causing `ENOMEM` during buffer setup (e.g., memory exhaustion) while probe or deferred-probe runs; the UAF is deterministic on that failure path and does not depend on winning a race or uncontrollable memory layout.\nPR:L - An unprivileged local user can exhaust system memory to force allocation failure during deferred-probe retries on embedded STM32 systems using legacy DFSDM bindings, without requiring init-namespace root or `CAP_SYS_MODULE`.\nUI:N - Exploitation does not require any victim user action such as mounting a filesystem or opening a file; memory pressure and kernel probe retries are sufficient.\nS:U - Impact is kernel heap memory corruption within the same kernel security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The bug is a slab use-after-free where the cleanup loop dereferences `buf-\u003ehead.next` after `iio_buffer_put()` frees the buffer object, enabling arbitrary kernel memory read primitives via heap grooming.\nI:H - Use-after-free on `hw_consumer_buffer` kmalloc objects can be leveraged for heap corruption and control-flow hijack to achieve arbitrary kernel write or code execution, not merely a bounded modification.\nA:H - The use-after-free dereference of freed list linkage commonly causes kernel oops/panic during the error cleanup path, and successful exploitation can fully compromise kernel availability."
            }
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        "dateUpdated": "2026-08-05T12:37:23.422Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63930",
    "datePublished": "2026-07-19T14:55:30.016Z",
    "dateReserved": "2026-07-19T07:54:57.021Z",
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    "state": "PUBLISHED"
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}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-GGVG-29PG-F22F

CVE-2026-63930 (GCVE-0-2026-63930)

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