Vulnerability-Lookup

GHSA-83MM-95M8-59X2

Vulnerability from github – Published: 2025-07-09 12:31 – Updated: 2025-11-19 21:31

Details

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

io_uring/rsrc: fix folio unpinning

syzbot complains about an unmapping failure:

[ 108.070381][ T14] kernel BUG at mm/gup.c:71! [ 108.070502][ T14] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025 [ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work [ 108.174205][ T14] Call trace: [ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P) [ 108.178138][ T14] unpin_user_page+0x80/0x10c [ 108.180189][ T14] io_release_ubuf+0x84/0xf8 [ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c [ 108.184345][ T14] io_rsrc_data_free+0x148/0x298 [ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0 [ 108.188991][ T14] io_ring_ctx_free+0x48/0x480 [ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8 [ 108.193207][ T14] process_one_work+0x7e8/0x155c [ 108.195431][ T14] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20

We can pin a tail page of a folio, but then io_uring will try to unpin the head page of the folio. While it should be fine in terms of keeping the page actually alive, mm folks say it's wrong and triggers a debug warning. Use unpin_user_folio() instead of unpin_user_page*.

[axboe: adapt to current tree, massage commit message]

Severity

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-38256"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-09T11:15:27Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: fix folio unpinning\n\nsyzbot complains about an unmapping failure:\n\n[  108.070381][   T14] kernel BUG at mm/gup.c:71!\n[  108.070502][   T14] Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n[  108.123672][   T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025\n[  108.127458][   T14] Workqueue: iou_exit io_ring_exit_work\n[  108.174205][   T14] Call trace:\n[  108.175649][   T14]  sanity_check_pinned_pages+0x7cc/0x7d0 (P)\n[  108.178138][   T14]  unpin_user_page+0x80/0x10c\n[  108.180189][   T14]  io_release_ubuf+0x84/0xf8\n[  108.182196][   T14]  io_free_rsrc_node+0x250/0x57c\n[  108.184345][   T14]  io_rsrc_data_free+0x148/0x298\n[  108.186493][   T14]  io_sqe_buffers_unregister+0x84/0xa0\n[  108.188991][   T14]  io_ring_ctx_free+0x48/0x480\n[  108.191057][   T14]  io_ring_exit_work+0x764/0x7d8\n[  108.193207][   T14]  process_one_work+0x7e8/0x155c\n[  108.195431][   T14]  worker_thread+0x958/0xed8\n[  108.197561][   T14]  kthread+0x5fc/0x75c\n[  108.199362][   T14]  ret_from_fork+0x10/0x20\n\nWe can pin a tail page of a folio, but then io_uring will try to unpin\nthe head page of the folio. While it should be fine in terms of keeping\nthe page actually alive, mm folks say it\u0027s wrong and triggers a debug\nwarning. Use unpin_user_folio() instead of unpin_user_page*.\n\n[axboe: adapt to current tree, massage commit message]",
  "id": "GHSA-83mm-95m8-59x2",
  "modified": "2025-11-19T21:31:15Z",
  "published": "2025-07-09T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4"
    }
  ],
  "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-2025-38256 (GCVE-0-2025-38256)

Vulnerability from cvelistv5 – Published: 2025-07-09 10:42 – Updated: 2026-05-11 21:24

Title

io_uring/rsrc: fix folio unpinning

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: fix folio unpinning syzbot complains about an unmapping failure: [ 108.070381][ T14] kernel BUG at mm/gup.c:71! [ 108.070502][ T14] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025 [ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work [ 108.174205][ T14] Call trace: [ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P) [ 108.178138][ T14] unpin_user_page+0x80/0x10c [ 108.180189][ T14] io_release_ubuf+0x84/0xf8 [ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c [ 108.184345][ T14] io_rsrc_data_free+0x148/0x298 [ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0 [ 108.188991][ T14] io_ring_ctx_free+0x48/0x480 [ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8 [ 108.193207][ T14] process_one_work+0x7e8/0x155c [ 108.195431][ T14] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20 We can pin a tail page of a folio, but then io_uring will try to unpin the head page of the folio. While it should be fine in terms of keeping the page actually alive, mm folks say it's wrong and triggers a debug warning. Use unpin_user_folio() instead of unpin_user_page*. [axboe: adapt to current tree, massage commit message]

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/53fd75f25b223878b…
https://git.kernel.org/stable/c/11e7b7369e655e613…
https://git.kernel.org/stable/c/5afb4bf9fc62d8286…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a8edbb424b1391b077407c75d8f5d2ede77aa70d , < 53fd75f25b223878b5fff14932e3a22f42b54f77 (git) Affected: a8edbb424b1391b077407c75d8f5d2ede77aa70d , < 11e7b7369e655e6131387b174218d7fa9557b3da (git) Affected: a8edbb424b1391b077407c75d8f5d2ede77aa70d , < 5afb4bf9fc62d828647647ec31745083637132e4 (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.36 , ≤ 6.12.* (semver) Unaffected: 6.15.5 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53fd75f25b223878b5fff14932e3a22f42b54f77",
              "status": "affected",
              "version": "a8edbb424b1391b077407c75d8f5d2ede77aa70d",
              "versionType": "git"
            },
            {
              "lessThan": "11e7b7369e655e6131387b174218d7fa9557b3da",
              "status": "affected",
              "version": "a8edbb424b1391b077407c75d8f5d2ede77aa70d",
              "versionType": "git"
            },
            {
              "lessThan": "5afb4bf9fc62d828647647ec31745083637132e4",
              "status": "affected",
              "version": "a8edbb424b1391b077407c75d8f5d2ede77aa70d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.36",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.5",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: fix folio unpinning\n\nsyzbot complains about an unmapping failure:\n\n[  108.070381][   T14] kernel BUG at mm/gup.c:71!\n[  108.070502][   T14] Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n[  108.123672][   T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025\n[  108.127458][   T14] Workqueue: iou_exit io_ring_exit_work\n[  108.174205][   T14] Call trace:\n[  108.175649][   T14]  sanity_check_pinned_pages+0x7cc/0x7d0 (P)\n[  108.178138][   T14]  unpin_user_page+0x80/0x10c\n[  108.180189][   T14]  io_release_ubuf+0x84/0xf8\n[  108.182196][   T14]  io_free_rsrc_node+0x250/0x57c\n[  108.184345][   T14]  io_rsrc_data_free+0x148/0x298\n[  108.186493][   T14]  io_sqe_buffers_unregister+0x84/0xa0\n[  108.188991][   T14]  io_ring_ctx_free+0x48/0x480\n[  108.191057][   T14]  io_ring_exit_work+0x764/0x7d8\n[  108.193207][   T14]  process_one_work+0x7e8/0x155c\n[  108.195431][   T14]  worker_thread+0x958/0xed8\n[  108.197561][   T14]  kthread+0x5fc/0x75c\n[  108.199362][   T14]  ret_from_fork+0x10/0x20\n\nWe can pin a tail page of a folio, but then io_uring will try to unpin\nthe head page of the folio. While it should be fine in terms of keeping\nthe page actually alive, mm folks say it\u0027s wrong and triggers a debug\nwarning. Use unpin_user_folio() instead of unpin_user_page*.\n\n[axboe: adapt to current tree, massage commit message]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:24:16.843Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77"
        },
        {
          "url": "https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3da"
        },
        {
          "url": "https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4"
        }
      ],
      "title": "io_uring/rsrc: fix folio unpinning",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38256",
    "datePublished": "2025-07-09T10:42:33.819Z",
    "dateReserved": "2025-04-16T04:51:23.997Z",
    "dateUpdated": "2026-05-11T21:24:16.843Z",
    "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.

Detection rules are retrieved from Rulezet.

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.