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GHSA-5VWG-96Q8-MM82

Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2025-05-06 18:30

Details

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

ublk: make sure ubq->canceling is set when queue is frozen

Now ublk driver depends on ubq->canceling for deciding if the request can be dispatched via uring_cmd & io_uring_cmd_complete_in_task().

Once ubq->canceling is set, the uring_cmd can be done via ublk_cancel_cmd() and io_uring_cmd_done().

So set ubq->canceling when queue is frozen, this way makes sure that the flag can be observed from ublk_queue_rq() reliably, and avoids use-after-free on uring_cmd.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-22068"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:16:01Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: make sure ubq-\u003ecanceling is set when queue is frozen\n\nNow ublk driver depends on `ubq-\u003ecanceling` for deciding if the request\ncan be dispatched via uring_cmd \u0026 io_uring_cmd_complete_in_task().\n\nOnce ubq-\u003ecanceling is set, the uring_cmd can be done via ublk_cancel_cmd()\nand io_uring_cmd_done().\n\nSo set ubq-\u003ecanceling when queue is frozen, this way makes sure that the\nflag can be observed from ublk_queue_rq() reliably, and avoids\nuse-after-free on uring_cmd.",
  "id": "GHSA-5vwg-96q8-mm82",
  "modified": "2025-05-06T18:30:36Z",
  "published": "2025-04-16T15:34:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22068"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5491400589e7572c2d2627ed6384302f7672aa1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e3497d7dacb5aee69dd9be842b778083cae0e75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8741d0737921ec1c03cf59aebf4d01400c2b461a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9158359015f0eda00e521e35b7bc7ebce176aebf"
    }
  ],
  "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-2025-22068 (GCVE-0-2025-22068)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:12 – Updated: 2026-08-05 11:56

Title

ublk: make sure ubq->canceling is set when queue is frozen

Summary

In the Linux kernel, the following vulnerability has been resolved: ublk: make sure ubq->canceling is set when queue is frozen Now ublk driver depends on `ubq->canceling` for deciding if the request can be dispatched via uring_cmd & io_uring_cmd_complete_in_task(). Once ubq->canceling is set, the uring_cmd can be done via ublk_cancel_cmd() and io_uring_cmd_done(). So set ubq->canceling when queue is frozen, this way makes sure that the flag can be observed from ublk_queue_rq() reliably, and avoids use-after-free on uring_cmd.

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 2025-10-01 16:16 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/7e3497d7dacb5aee6…
https://git.kernel.org/stable/c/5491400589e7572c2…
https://git.kernel.org/stable/c/9158359015f0eda00…
https://git.kernel.org/stable/c/8741d0737921ec1c0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 216c8f5ef0f209a3797292c487bdaa6991ab4b92 , < 7e3497d7dacb5aee69dd9be842b778083cae0e75 (git) Affected: 216c8f5ef0f209a3797292c487bdaa6991ab4b92 , < 5491400589e7572c2d2627ed6384302f7672aa1d (git) Affected: 216c8f5ef0f209a3797292c487bdaa6991ab4b92 , < 9158359015f0eda00e521e35b7bc7ebce176aebf (git) Affected: 216c8f5ef0f209a3797292c487bdaa6991ab4b92 , < 8741d0737921ec1c03cf59aebf4d01400c2b461a (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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{
  "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"
            }
          },
          {
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              "content": {
                "id": "CVE-2025-22068",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T16:16:10.823275Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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          "dateUpdated": "2025-10-01T16:16:13.925Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/block/ublk_drv.c"
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            {
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.12.23",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.11",
                  "versionStartIncluding": "6.7",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: make sure ubq-\u003ecanceling is set when queue is frozen\n\nNow ublk driver depends on `ubq-\u003ecanceling` for deciding if the request\ncan be dispatched via uring_cmd \u0026 io_uring_cmd_complete_in_task().\n\nOnce ubq-\u003ecanceling is set, the uring_cmd can be done via ublk_cancel_cmd()\nand io_uring_cmd_done().\n\nSo set ubq-\u003ecanceling when queue is frozen, this way makes sure that the\nflag can be observed from ublk_queue_rq() reliably, and avoids\nuse-after-free on uring_cmd."
        }
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            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - Triggering requires local access to the ublk control/char/block devices (`/dev/ublk-control`, `/dev/ublkcN`, `/dev/ublkbN`) and io_uring syscalls. There is no remote or adjacent-network path into `ublk_queue_rq()` or the uring_cmd cancel handler.\nAC:L - The attacker controls both sides of the race \u2014 it submits a continuous block-I/O stream to its own ublk block device while concurrently closing the io_uring ring or killing the ublk server task to drive `ublk_uring_cmd_cancel_fn()` \u2192 `ublk_abort_requests()`. The window can be retried indefinitely at no cost, and ublk is enabled in mainstream distribution kernels.\nPR:L - `ublk_ctrl_add_dev()` explicitly allows a caller without CAP_SYS_ADMIN to create a device with `UBLK_F_UNPRIVILEGED_DEV`, with subsequent control commands gated only by `inode_permission()` on the owner-owned char device, so an ordinary local user can create, serve and issue I/O to a ublk device. Even for admin-created devices, the ublk server daemon and the exposed block device are routinely driven by non-root contexts.\nUI:N - The attacker performs every step itself \u2014 creating the device, running the server, submitting I/O, and tearing down the io_uring ring. No action by any other user or administrator is needed.\nS:U - The corruption is of an io_uring `io_kiocb` inside the kernel, exploited from a local process; impact stays within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free on the uring_cmd/`io_kiocb`: the freed object is re-read (`ioucmd-\u003etask_work_cb`, `req-\u003ectx`, `req-\u003eio_task_work`) after reallocation, and the resulting controlled call/deref can be steered into an arbitrary kernel-memory disclosure primitive via the io_uring completion path.\nI:H - `__io_uring_cmd_do_in_task()` writes `task_work_cb` and `io_task_work.func` into the already-freed request and links it onto the ring\u0027s task-work list, and `io_uring_cmd_work()` then performs an indirect call through a function pointer sourced from that freed, heap-sprayable slab object \u2014 a write plus control-flow-hijack primitive leading to privilege escalation.\nA:H - Even unweaponized, the double-use of the uring_cmd causes double completion and use-after-free of the io_uring request, producing kernel oops/panic; the sibling fix for the same pairing was reported as a reproducible kernel crash."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22068",
    "datePublished": "2025-04-16T14:12:21.436Z",
    "dateReserved": "2024-12-29T08:45:45.814Z",
    "dateUpdated": "2026-08-05T11:56:29.279Z",
    "state": "PUBLISHED"
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}

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.

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.
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GHSA-5VWG-96Q8-MM82

CVE-2025-22068 (GCVE-0-2025-22068)

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