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GHSA-3G6Q-J56Q-QW54

Vulnerability from github – Published: 2025-05-08 09:30 – Updated: 2025-06-05 15:31

Details

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

driver core: fix potential NULL pointer dereference in dev_uevent()

If userspace reads "uevent" device attribute at the same time as another threads unbinds the device from its driver, change to dev->driver from a valid pointer to NULL may result in crash. Fix this by using READ_ONCE() when fetching the pointer, and take bus' drivers klist lock to make sure driver instance will not disappear while we access it.

Use WRITE_ONCE() when setting the driver pointer to ensure there is no tearing.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37800"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-08T07:15:50Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential NULL pointer dereference in dev_uevent()\n\nIf userspace reads \"uevent\" device attribute at the same time as another\nthreads unbinds the device from its driver, change to dev-\u003edriver from a\nvalid pointer to NULL may result in crash. Fix this by using READ_ONCE()\nwhen fetching the pointer, and take bus\u0027 drivers klist lock to make sure\ndriver instance will not disappear while we access it.\n\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\ntearing.",
  "id": "GHSA-3g6q-j56q-qw54",
  "modified": "2025-06-05T15:31:22Z",
  "published": "2025-05-08T09:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-37800 (GCVE-0-2025-37800)

Vulnerability from cvelistv5 – Published: 2025-05-08 06:26 – Updated: 2026-08-05 11:57

Title

driver core: fix potential NULL pointer dereference in dev_uevent()

Summary

In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential NULL pointer dereference in dev_uevent() If userspace reads "uevent" device attribute at the same time as another threads unbinds the device from its driver, change to dev->driver from a valid pointer to NULL may result in crash. Fix this by using READ_ONCE() when fetching the pointer, and take bus' drivers klist lock to make sure driver instance will not disappear while we access it. Use WRITE_ONCE() when setting the driver pointer to ensure there is no tearing.

Severity

7.1 (High)


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

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/abe56be73eb10a677…
https://git.kernel.org/stable/c/2b344e779d9afd0fc…
https://git.kernel.org/stable/c/3781e4b83e1743649…
https://git.kernel.org/stable/c/18daa52418e7e4629…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < abe56be73eb10a677d16066f65ff9d30251f5eee (git) Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb (git) Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 3781e4b83e174364998855de777e184cf0b62c40 (git) Affected: 16574dccd8f62dc1b585325f8a6a0aab10047ed8 , < 18daa52418e7e4629ed1703b64777294209d2622 (git)
Linux	Linux	Affected: 2.6.22 Unaffected: 0 , < 2.6.22 (semver) Unaffected: 6.6.89 , ≤ 6.6.* (semver) Unaffected: 6.12.26 , ≤ 6.12.* (semver) Unaffected: 6.14.5 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/base.h",
            "drivers/base/bus.c",
            "drivers/base/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "abe56be73eb10a677d16066f65ff9d30251f5eee",
              "status": "affected",
              "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8",
              "versionType": "git"
            },
            {
              "lessThan": "2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb",
              "status": "affected",
              "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8",
              "versionType": "git"
            },
            {
              "lessThan": "3781e4b83e174364998855de777e184cf0b62c40",
              "status": "affected",
              "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8",
              "versionType": "git"
            },
            {
              "lessThan": "18daa52418e7e4629ed1703b64777294209d2622",
              "status": "affected",
              "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/base.h",
            "drivers/base/bus.c",
            "drivers/base/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.89",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.26",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.89",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.26",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.5",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential NULL pointer dereference in dev_uevent()\n\nIf userspace reads \"uevent\" device attribute at the same time as another\nthreads unbinds the device from its driver, change to dev-\u003edriver from a\nvalid pointer to NULL may result in crash. Fix this by using READ_ONCE()\nwhen fetching the pointer, and take bus\u0027 drivers klist lock to make sure\ndriver instance will not disappear while we access it.\n\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\ntearing."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached by read(2) on a sysfs file (`/sys/devices/**/uevent`) and the racing unbind via ioctl on `/dev/bus/usb/*`, both requiring a local account on the system. There is no network-facing path into `dev_uevent()`.\nAC:L - The attacker controls both sides of the race: an unprivileged thread spins reading the world-readable `uevent` attribute while another thread toggles `USBDEVFS_DISCONNECT`/`USBDEVFS_CONNECT` (or CLAIM/RELEASE_INTERFACE) on the same USB interface, driving `dev-\u003edriver` between a valid pointer and NULL at will. No condition depends on state outside the attacker\u0027s influence, and the window can be retried indefinitely at high rate.\nPR:L - `dev_attr_uevent` is DEVICE_ATTR_RW (0644), so any unprivileged local user can read it, and the usbfs disconnect/connect ioctls have no `capable()` check \u2014 only rw access to a `/dev/bus/usb` node, which udev `uaccess` rules routinely grant to the logged-in seat user. No root or capability is required.\nUI:N - The attacker performs both the sysfs read and the driver unbind from their own processes; no victim action is needed. On kiosk-style systems the routine hotplug churn that also triggers it happens without any deliberate user step.\nS:U - The fault and its consequences are confined to the kernel of the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - If the driver is unregistered and its module unloaded after the pointer is loaded, `drv-\u003ename` is read from freed memory and the resulting dangling `char *` is expanded by `add_uevent_var(env, \"DRIVER=%s\", ...)` into the env buffer that `uevent_show()` copies back to the unprivileged reader \u2014 a use-after-free read that leaks arbitrary kernel memory contents to userspace. The fix\u0027s klist_drivers lock exists specifically to stop the driver structure disappearing mid-read.\nI:N - The racy path only loads `dev-\u003edriver` and formats `drv-\u003ename` into a bounded, kernel-allocated uevent buffer; it performs no attacker-influenced write to kernel memory and yields no control-flow hijack primitive.\nA:H - Reloading `dev-\u003edriver` as NULL makes `dev-\u003edriver-\u003ename` a NULL-page dereference, and the freed-module variant faults on unmapped vmalloc memory \u2014 either way an oops in the driver-core read path, repeatable at will for a reliable local denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:57:39.250Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40"
        },
        {
          "url": "https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622"
        }
      ],
      "title": "driver core: fix potential NULL pointer dereference in dev_uevent()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37800",
    "datePublished": "2025-05-08T06:26:01.125Z",
    "dateReserved": "2025-04-16T04:51:23.941Z",
    "dateUpdated": "2026-08-05T11:57:39.250Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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-3G6Q-J56Q-QW54

CVE-2025-37800 (GCVE-0-2025-37800)

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