CVE-2025-38453 (GCVE-0-2025-38453)

Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2026-08-05 12:02
VLAI
Title
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that defer/local task_work adding via msg_ring can hit a request that has been freed: CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 io_req_local_work_add io_uring/io_uring.c:1184 [inline] __io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252 io_msg_remote_post io_uring/msg_ring.c:103 [inline] io_msg_data_remote io_uring/msg_ring.c:133 [inline] __io_msg_ring_data+0x820/0xaa0 io_uring/msg_ring.c:151 io_msg_ring_data io_uring/msg_ring.c:173 [inline] io_msg_ring+0x134/0xa00 io_uring/msg_ring.c:314 __io_issue_sqe+0x17e/0x4b0 io_uring/io_uring.c:1739 io_issue_sqe+0x165/0xfd0 io_uring/io_uring.c:1762 io_wq_submit_work+0x6e9/0xb90 io_uring/io_uring.c:1874 io_worker_handle_work+0x7cd/0x1180 io_uring/io-wq.c:642 io_wq_worker+0x42f/0xeb0 io_uring/io-wq.c:696 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> which is supposed to be safe with how requests are allocated. But msg ring requests alloc and free on their own, and hence must defer freeing to a sane time. Add an rcu_head and use kfree_rcu() in both spots where requests are freed. Only the one in io_msg_tw_complete() is strictly required as it has been visible on the other ring, but use it consistently in the other spot as well. This should not cause any other issues outside of KASAN rightfully complaining about it.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0617bb500bfabf8447062f1e1edde92ed2b638f1 , < 094ba14a471cc6c68078c7ad488539eaf32c2277 (git)
Affected: 0617bb500bfabf8447062f1e1edde92ed2b638f1 , < e5b3432f4a6b418b8bd8fc91f38efbf17a77167a (git)
Affected: 0617bb500bfabf8447062f1e1edde92ed2b638f1 , < fc582cd26e888b0652bc1494f252329453fd3b23 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU\n\nsyzbot reports that defer/local task_work adding via msg_ring can hit\na request that has been freed:\n\nCPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xd2/0x2b0 mm/kasan/report.c:521\n kasan_report+0x118/0x150 mm/kasan/report.c:634\n io_req_local_work_add io_uring/io_uring.c:1184 [inline]\n __io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252\n io_msg_remote_post io_uring/msg_ring.c:103 [inline]\n io_msg_data_remote io_uring/msg_ring.c:133 [inline]\n __io_msg_ring_data+0x820/0xaa0 io_uring/msg_ring.c:151\n io_msg_ring_data io_uring/msg_ring.c:173 [inline]\n io_msg_ring+0x134/0xa00 io_uring/msg_ring.c:314\n __io_issue_sqe+0x17e/0x4b0 io_uring/io_uring.c:1739\n io_issue_sqe+0x165/0xfd0 io_uring/io_uring.c:1762\n io_wq_submit_work+0x6e9/0xb90 io_uring/io_uring.c:1874\n io_worker_handle_work+0x7cd/0x1180 io_uring/io-wq.c:642\n io_wq_worker+0x42f/0xeb0 io_uring/io-wq.c:696\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nwhich is supposed to be safe with how requests are allocated. But msg\nring requests alloc and free on their own, and hence must defer freeing\nto a sane time.\n\nAdd an rcu_head and use kfree_rcu() in both spots where requests are\nfreed. Only the one in io_msg_tw_complete() is strictly required as it\nhas been visible on the other ring, but use it consistently in the other\nspot as well.\n\nThis should not cause any other issues outside of KASAN rightfully\ncomplaining about it."
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            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/msg_ring: garantizar que la liberaci\u00f3n de io_kiocb se posponga para RCU syzbot informa que agregar defer/local task_work mediante msg_ring puede afectar a una solicitud que se ha liberado: CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 No contaminado 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Rastreo de llamadas:  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 io_req_local_work_add io_uring/io_uring.c:1184 [inline] __io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252 io_msg_remote_post io_uring/msg_ring.c:103 [inline] io_msg_data_remote io_uring/msg_ring.c:133 [inline] __io_msg_ring_data+0x820/0xaa0 io_uring/msg_ring.c:151 io_msg_ring_data io_uring/msg_ring.c:173 [inline] io_msg_ring+0x134/0xa00 io_uring/msg_ring.c:314 __io_issue_sqe+0x17e/0x4b0 io_uring/io_uring.c:1739 io_issue_sqe+0x165/0xfd0 io_uring/io_uring.c:1762 io_wq_submit_work+0x6e9/0xb90 io_uring/io_uring.c:1874 io_worker_handle_work+0x7cd/0x1180 io_uring/io-wq.c:642 io_wq_worker+0x42f/0xeb0 io_uring/io-wq.c:696 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245  que se supone que es seguro con la asignaci\u00f3n de solicitudes. Sin embargo, las solicitudes del anillo msg asignan y liberan por s\u00ed solas, por lo que deben posponer la liberaci\u00f3n hasta un momento razonable. Agregue un rcu_head y use kfree_rcu() en ambos puntos donde se liberan las solicitudes. Solo el de io_msg_tw_complete() es estrictamente obligatorio, ya que ha sido visible en el otro anillo, pero \u00faselo consistentemente tambi\u00e9n en el otro punto. Esto no deber\u00eda causar otros problemas, aparte de las quejas leg\u00edtimas de KASAN."
          }
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        "id": "CVE-2025-38453",
        "lastModified": "2026-07-30T06:23:15.053",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-07-25T16:15:30.913",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/094ba14a471cc6c68078c7ad488539eaf32c2277"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e5b3432f4a6b418b8bd8fc91f38efbf17a77167a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fc582cd26e888b0652bc1494f252329453fd3b23"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:08:10+00:00",
      "cve": "CVE-2025-38453",
      "id": "CVE-2025-38453",
      "initial_release_date": "2025-07-25T00:00:00+00:00",
      "product_status:fixed": "616",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38453.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.