Vulnerability-Lookup

GHSA-5F2M-5GJF-8MQG

Vulnerability from github – Published: 2025-04-01 18:30 – Updated: 2025-04-11 15:32

Details

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

HID: hid-steam: Fix use-after-free when detaching device

When a hid-steam device is removed it must clean up the client_hdev used for intercepting hidraw access. This can lead to scheduling deferred work to reattach the input device. Though the cleanup cancels the deferred work, this was done before the client_hdev itself is cleaned up, so it gets rescheduled. This patch fixes the ordering to make sure the deferred work is properly canceled.

Severity

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-21923"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-01T16:15:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: hid-steam: Fix use-after-free when detaching device\n\nWhen a hid-steam device is removed it must clean up the client_hdev used for\nintercepting hidraw access. This can lead to scheduling deferred work to\nreattach the input device. Though the cleanup cancels the deferred work, this\nwas done before the client_hdev itself is cleaned up, so it gets rescheduled.\nThis patch fixes the ordering to make sure the deferred work is properly\ncanceled.",
  "id": "GHSA-5f2m-5gjf-8mqg",
  "modified": "2025-04-11T15:32:27Z",
  "published": "2025-04-01T18:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21923"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/026714ec7546de741826324a6a1914c91024d06c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a899adf7063c6745aaff1ec869f3c7f6329ed0a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e53fc232a65f7488ab75d03a5b95f06aaada7262"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea3f18d2f02629653b7bfe42607737ccd1343e54"
    }
  ],
  "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-2025-21923 (GCVE-0-2025-21923)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-08-05 11:55

Title

HID: hid-steam: Fix use-after-free when detaching device

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: hid-steam: Fix use-after-free when detaching device When a hid-steam device is removed it must clean up the client_hdev used for intercepting hidraw access. This can lead to scheduling deferred work to reattach the input device. Though the cleanup cancels the deferred work, this was done before the client_hdev itself is cleaned up, so it gets rescheduled. This patch fixes the ordering to make sure the deferred work is properly canceled.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-16 13:15 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6667 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/026714ec7546de741…
https://git.kernel.org/stable/c/a899adf7063c6745a…
https://git.kernel.org/stable/c/ea3f18d2f02629653…
https://git.kernel.org/stable/c/e53fc232a65f7488a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e1147961b2145fa61c3078a4a797d9576cde91ab , < 026714ec7546de741826324a6a1914c91024d06c (git) Affected: 3e38cbbfa0a128a9d64773240a9eb3bc7bae3b1a , < a899adf7063c6745aaff1ec869f3c7f6329ed0a1 (git) Affected: 053fa3888d2a957f4db26c05e503f4c6b9570a30 , < ea3f18d2f02629653b7bfe42607737ccd1343e54 (git) Affected: 79504249d7e27cad4a3eeb9afc6386e418728ce0 , < e53fc232a65f7488ab75d03a5b95f06aaada7262 (git)
Linux	Linux	Affected: 6.6.79 , < 6.6.83 (semver) Affected: 6.12.16 , < 6.12.19 (semver) Affected: 6.13.4 , < 6.13.7 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21923",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-16T13:15:09.842820Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-16T13:19:53.000Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-steam.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "026714ec7546de741826324a6a1914c91024d06c",
              "status": "affected",
              "version": "e1147961b2145fa61c3078a4a797d9576cde91ab",
              "versionType": "git"
            },
            {
              "lessThan": "a899adf7063c6745aaff1ec869f3c7f6329ed0a1",
              "status": "affected",
              "version": "3e38cbbfa0a128a9d64773240a9eb3bc7bae3b1a",
              "versionType": "git"
            },
            {
              "lessThan": "ea3f18d2f02629653b7bfe42607737ccd1343e54",
              "status": "affected",
              "version": "053fa3888d2a957f4db26c05e503f4c6b9570a30",
              "versionType": "git"
            },
            {
              "lessThan": "e53fc232a65f7488ab75d03a5b95f06aaada7262",
              "status": "affected",
              "version": "79504249d7e27cad4a3eeb9afc6386e418728ce0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-steam.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.6.83",
              "status": "affected",
              "version": "6.6.79",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.19",
              "status": "affected",
              "version": "6.12.16",
              "versionType": "semver"
            },
            {
              "lessThan": "6.13.7",
              "status": "affected",
              "version": "6.13.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.83",
                  "versionStartIncluding": "6.6.79",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.19",
                  "versionStartIncluding": "6.12.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.7",
                  "versionStartIncluding": "6.13.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: hid-steam: Fix use-after-free when detaching device\n\nWhen a hid-steam device is removed it must clean up the client_hdev used for\nintercepting hidraw access. This can lead to scheduling deferred work to\nreattach the input device. Though the cleanup cancels the deferred work, this\nwas done before the client_hdev itself is cleaned up, so it gets rescheduled.\nThis patch fixes the ordering to make sure the deferred work is properly\ncanceled."
        }
      ],
      "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 whole sequence is local char-device work \u2014 `UHID_CREATE2` on `/dev/uhid` forging a `BUS_USB 28de:1102` device, `open()` of the resulting client `/dev/hidrawN`, then `UHID_DESTROY` \u2014 and hid-steam has no `hid_is_usb()`/`hid_to_usb_dev()` guard while `uhid_dev_create2()` copies `bus`/`vendor`/`product` and the report descriptor verbatim from userspace. Physically attaching and unplugging a real or emulated Steam Controller is an alternative, strictly lower-severity vector.\nAC:L - The attacker performs both required steps himself and in order \u2014 hold the client hidraw node open, then tear the device down \u2014 and the re-queue of `unregister_work` from `hidraw_disconnect()` \u2192 `hid_hw_close()` \u2192 `steam_client_ll_close()` happens unconditionally after the cancel, so there is no race window to win and no state outside his control. Heap grooming before the worker runs is likewise attacker-driven, and creating further uhid steam devices reclaims the identical devm allocation size.\nPR:L - No capability check exists anywhere on the path \u2014 neither `uhid_dev_create2()` nor `steam_probe()` tests any `CAP_*` \u2014 so access is governed purely by DAC on `/dev/uhid` and `/dev/hidraw*`, which systemd/udev `uaccess`-tag for the logged-in seat user on desktop and Android-class systems and which are routinely exposed inside privileged containers. On real hardware the unprivileged Steam client is precisely the process holding the client hidraw open when the controller is detached.\nUI:N - The attacker\u0027s own process creates the device, opens the client hidraw node, and triggers the removal, and the deferred work then runs automatically on the system workqueue. No action by any other user \u2014 no mount, login, or file open \u2014 is required.\nS:U - The freed `struct steam_device`, the freed parent `struct hid_device`, and every corrupted structure live in kernel memory under the kernel\u0027s own security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free of an object whose contents are read back after free \u2014 `steam_work_unregister_cb()` reads `steam-\u003eclient_opened`/`steam-\u003econnected`, and `steam_send_report()` reads `steam-\u003ehdev-\u003ereport_enum[HID_FEATURE_REPORT].report_id_hash[0]` plus `hid_report_len()` from the freed hid_device. Reallocating the slab with controlled data turns that chain into an attacker-directed arbitrary kernel read, and per UAF guidance confidentiality impact is High.\nI:H - Two independent write/control primitives exist: the workqueue stores into `work-\u003edata` inside the freed object and then performs an indirect call to `work-\u003efunc(work)` read from freed memory, and the callback additionally does `rcu_assign_pointer(steam-\u003einput/sensors, ...)` writes into the freed struct and dispatches `hid_hw_raw_request()` through the freed hdev\u0027s `ll_driver` function-pointer table. Heap-spray reallocation converts either into control-flow hijacking and arbitrary write.\nA:H - The defect is the slab-use-after-free reported by syzbot (syzbot+0154da2d403396b2bd59), which produces KASAN slab-use-after-free splats, workqueue corruption, and kernel oops/panic \u2014 a full panic under `panic_on_oops`. It is re-triggerable at will by repeating the create/open/destroy cycle."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:55:21.882Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/026714ec7546de741826324a6a1914c91024d06c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a899adf7063c6745aaff1ec869f3c7f6329ed0a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea3f18d2f02629653b7bfe42607737ccd1343e54"
        },
        {
          "url": "https://git.kernel.org/stable/c/e53fc232a65f7488ab75d03a5b95f06aaada7262"
        }
      ],
      "title": "HID: hid-steam: Fix use-after-free when detaching device",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21923",
    "datePublished": "2025-04-01T15:40:56.229Z",
    "dateReserved": "2024-12-29T08:45:45.788Z",
    "dateUpdated": "2026-08-05T11:55:21.882Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted