CVE-2026-63930 (GCVE-0-2026-63930)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-08-05 12:37
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
Version: 48b66f8f936f369bb1a43c12aedbfeb2975baf4c
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/buffer/industrialio-hw-consumer.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "version": "5.10.259",
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              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "4.16",
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                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:37:23.422Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b71893c57730809c222766e5718bb33610f11963"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ff615fc455acda5425c4900160cbe11cfea4449"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2759d49860b9a39b5cde2fb88e4b822ddf5f58f"
        },
        {
          "url": "https://git.kernel.org/stable/c/29783e6b6ec0b7152a15e53a063f17537e81177d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e965627f0d442bfcae3f496c90cb653fb0917a61"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3763ae33476328cf8d661742deb9daec78eac96"
        },
        {
          "url": "https://git.kernel.org/stable/c/9319c94f63ed10723afd738d79f5617daba87cc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4"
        }
      ],
      "title": "iio: buffer: hw-consumer: fix use-after-free in error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63930",
    "datePublished": "2026-07-19T14:55:30.016Z",
    "dateReserved": "2026-07-19T07:54:57.021Z",
    "dateUpdated": "2026-08-05T12:37:23.422Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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