FKIE_CVE-2026-53025

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-06-28 08:16
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: greybus: raw: fix use-after-free on cdev close This addresses a use-after-free bug when a raw bundle is disconnected but its chardev is still opened by an application. When the application releases the cdev, it causes the following panic when init on free is enabled (CONFIG_INIT_ON_FREE_DEFAULT_ON=y): refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 139 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130 ... Call Trace: <TASK> cdev_put+0x18/0x30 __fput+0x255/0x2a0 __x64_sys_close+0x3d/0x80 do_syscall_64+0xa4/0x290 entry_SYSCALL_64_after_hwframe+0x77/0x7f The cdev is contained in the "gb_raw" structure, which is freed in the disconnect operation. When the cdev is released at a later time, cdev_put gets an address that points to freed memory. To fix this use-after-free, convert the struct device from a pointer to being embedded, that makes the lifetime of the cdev and of this device the same. Then, use cdev_device_add, which guarantees that the device won't be released until all references to the cdev have been released. Finally, delegate the freeing of the structure to the device release function, instead of freeing immediately in the disconnect callback.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/983cc2c7efbce04ecbf6328448d895044dd6ab31
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef2d97c15b19b3489de01695bce478601e236c3e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/greybus/raw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ef2d97c15b19b3489de01695bce478601e236c3e",
              "status": "affected",
              "version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
              "versionType": "git"
            },
            {
              "lessThan": "983cc2c7efbce04ecbf6328448d895044dd6ab31",
              "status": "affected",
              "version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/greybus/raw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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\ngreybus: raw: fix use-after-free on cdev close\n\nThis addresses a use-after-free bug when a raw bundle is disconnected\nbut its chardev is still opened by an application. When the application\nreleases the cdev, it causes the following panic when init on free is\nenabled (CONFIG_INIT_ON_FREE_DEFAULT_ON=y):\n\n        refcount_t: underflow; use-after-free.\n        WARNING: CPU: 0 PID: 139 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130\n         ...\n        Call Trace:\n         \u003cTASK\u003e\n         cdev_put+0x18/0x30\n         __fput+0x255/0x2a0\n         __x64_sys_close+0x3d/0x80\n         do_syscall_64+0xa4/0x290\n         entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe cdev is contained in the \"gb_raw\" structure, which is freed in the\ndisconnect operation. When the cdev is released at a later time,\ncdev_put gets an address that points to freed memory.\n\nTo fix this use-after-free, convert the struct device from a pointer to\nbeing embedded, that makes the lifetime of the cdev and of this device\nthe same. Then, use cdev_device_add, which guarantees that the device\nwon\u0027t be released until all references to the cdev have been released.\nFinally, delegate the freeing of the structure to the device release\nfunction, instead of freeing immediately in the disconnect callback."
    }
  ],
  "id": "CVE-2026-53025",
  "lastModified": "2026-06-28T08:16:30.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-24T17:17:13.857",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/983cc2c7efbce04ecbf6328448d895044dd6ab31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef2d97c15b19b3489de01695bce478601e236c3e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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