CVE-2026-89941

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Make IIO DMA fence release RCU-safe The `dma_fence` documentation states that if a custom release implementation is provided, the `dma_fence` object must be freed in an RCU-safe way. The current `iio_dma_fence` implementation uses `kfree()`, which might result in a use-after-free. Remove the custom `release` implementation. This makes the DMA fence core fall back to `dma_fence_free()`, which calls `kfree_rcu()` on the fence. This requires that the fence be the first member of `struct iio_dma_fence`. Using the default release method for extended DMA fence structures is a common pattern.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-16 11:17:03.733000

Last modified

2026-10-19 09:18:39.923000

View original CVE JSON

{
  "id": "CVE-2026-89941",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-16T11:17:03.733",
  "lastModified": "2026-10-19T09:18:39.923",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Make IIO DMA fence release RCU-safe\n\nThe `dma_fence` documentation states that if a custom release\nimplementation is provided, the `dma_fence` object must be freed in an\nRCU-safe way. The current `iio_dma_fence` implementation uses `kfree()`,\nwhich might result in a use-after-free.\n\nRemove the custom `release` implementation. This makes the DMA fence core\nfall back to `dma_fence_free()`, which calls `kfree_rcu()` on the fence.\nThis requires that the fence be the first member of `struct iio_dma_fence`.\n\nUsing the default release method for extended DMA fence structures is a\ncommon pattern."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/iio/industrialio-buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
              "lessThan": "311595dc0b5621f74d8eb4dc38ef4efcdfe7e769",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
              "lessThan": "06a9460b8b792e109cbc934a856d02e5cff217ef",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
              "lessThan": "11cef99491117d4264603df159c4ff5f3845a059",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
              "lessThan": "8662e56c31cf23b61ca3d11b516efb94c35b8026",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/iio/industrialio-buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.11",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.51",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.5",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/06a9460b8b792e109cbc934a856d02e5cff217ef",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/11cef99491117d4264603df159c4ff5f3845a059",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/311595dc0b5621f74d8eb4dc38ef4efcdfe7e769",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8662e56c31cf23b61ca3d11b516efb94c35b8026",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}