Vulnerability-Lookup

FKIE_CVE-2025-39945

Vulnerability from fkie_nvd - Published: 2025-10-04 08:15 - Updated: 2026-10-19 21:10

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: cnic: Fix use-after-free bugs in cnic_delete_task The original code uses cancel_delayed_work() in cnic_cm_stop_bnx2x_hw(), which does not guarantee that the delayed work item 'delete_task' has fully completed if it was already running. Additionally, the delayed work item is cyclic, the flush_workqueue() in cnic_cm_stop_bnx2x_hw() only blocks and waits for work items that were already queued to the workqueue prior to its invocation. Any work items submitted after flush_workqueue() is called are not included in the set of tasks that the flush operation awaits. This means that after the cyclic work items have finished executing, a delayed work item may still exist in the workqueue. This leads to use-after-free scenarios where the cnic_dev is deallocated by cnic_free_dev(), while delete_task remains active and attempt to dereference cnic_dev in cnic_delete_task(). A typical race condition is illustrated below: CPU 0 (cleanup) | CPU 1 (delayed work callback) cnic_netdev_event() | cnic_stop_hw() | cnic_delete_task() cnic_cm_stop_bnx2x_hw() | ... cancel_delayed_work() | /* the queue_delayed_work() flush_workqueue() | executes after flush_workqueue()*/ | queue_delayed_work() cnic_free_dev(dev)//free | cnic_delete_task() //new instance | dev = cp->dev; //use Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure that the cyclic delayed work item is properly canceled and that any ongoing execution of the work item completes before the cnic_dev is deallocated. Furthermore, since cancel_delayed_work_sync() uses __flush_work(work, true) to synchronously wait for any currently executing instance of the work item to finish, the flush_workqueue() becomes redundant and should be removed. This bug was identified through static analysis. To reproduce the issue and validate the fix, I simulated the cnic PCI device in QEMU and introduced intentional delays — such as inserting calls to ssleep() within the cnic_delete_task() function — to increase the likelihood of triggering the bug.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0405055930264ea8fd26f4131466fa7652e5e47d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0627e1481676669cae2df0d85b5ff13e7d24c390	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e33a7eed587062ca8161ad1f4584882a860d697	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7b6a5b0a6b392263c3767fc945b311ea04b34bbd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8eeb2091e72d75df8ceaa2172638d61b4cf8929a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cfa7d9b1e3a8604afc84e9e51d789c29574fb216	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e1fcd4a9c09feac0902a65615e866dbf22616125	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fde6e73189f40ebcf0633aed2b68e731c25f3aa3	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17

JSON

To clipboard

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncnic: Fix use-after-free bugs in cnic_delete_task\n\nThe original code uses cancel_delayed_work() in cnic_cm_stop_bnx2x_hw(),\nwhich does not guarantee that the delayed work item \u0027delete_task\u0027 has\nfully completed if it was already running. Additionally, the delayed work\nitem is cyclic, the flush_workqueue() in cnic_cm_stop_bnx2x_hw() only\nblocks and waits for work items that were already queued to the\nworkqueue prior to its invocation. Any work items submitted after\nflush_workqueue() is called are not included in the set of tasks that the\nflush operation awaits. This means that after the cyclic work items have\nfinished executing, a delayed work item may still exist in the workqueue.\nThis leads to use-after-free scenarios where the cnic_dev is deallocated\nby cnic_free_dev(), while delete_task remains active and attempt to\ndereference cnic_dev in cnic_delete_task().\n\nA typical race condition is illustrated below:\n\nCPU 0 (cleanup)              | CPU 1 (delayed work callback)\ncnic_netdev_event()          |\n  cnic_stop_hw()             | cnic_delete_task()\n    cnic_cm_stop_bnx2x_hw()  | ...\n      cancel_delayed_work()  | /* the queue_delayed_work()\n      flush_workqueue()      |    executes after flush_workqueue()*/\n                             | queue_delayed_work()\n  cnic_free_dev(dev)//free   | cnic_delete_task() //new instance\n                             |   dev = cp-\u003edev; //use\n\nReplace cancel_delayed_work() with cancel_delayed_work_sync() to ensure\nthat the cyclic delayed work item is properly canceled and that any\nongoing execution of the work item completes before the cnic_dev is\ndeallocated. Furthermore, since cancel_delayed_work_sync() uses\n__flush_work(work, true) to synchronously wait for any currently\nexecuting instance of the work item to finish, the flush_workqueue()\nbecomes redundant and should be removed.\n\nThis bug was identified through static analysis. To reproduce the issue\nand validate the fix, I simulated the cnic PCI device in QEMU and\nintroduced intentional delays \u2014 such as inserting calls to ssleep()\nwithin the cnic_delete_task() function \u2014 to increase the likelihood\nof triggering the bug."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncnic: Correcci\u00f3n de errores de uso despu\u00e9s de liberaci\u00f3n en cnic_delete_task\n\nEl c\u00f3digo original utiliza cancel_delayed_work() en cnic_cm_stop_bnx2x_hw(), lo que no garantiza que el elemento de trabajo retrasado \u0027delete_task\u0027 se haya completado por completo si ya estaba en ejecuci\u00f3n. Adem\u00e1s, el elemento de trabajo retrasado es c\u00edclico, el flush_workqueue() en cnic_cm_stop_bnx2x_hw() solo bloquea y espera por elementos de trabajo que ya estaban encolados en la cola de trabajo antes de su invocaci\u00f3n. Cualquier elemento de trabajo enviado despu\u00e9s de que se llama a flush_workqueue() no se incluye en el conjunto de tareas que la operaci\u00f3n de vaciado espera. Esto significa que despu\u00e9s de que los elementos de trabajo c\u00edclicos hayan terminado de ejecutarse, un elemento de trabajo retrasado a\u00fan puede existir en la cola de trabajo. Esto lleva a escenarios de uso despu\u00e9s de liberaci\u00f3n donde el cnic_dev es desasignado por cnic_free_dev(), mientras delete_task permanece activo e intenta desreferenciar cnic_dev en cnic_delete_task().\n\nUna condici\u00f3n de carrera t\u00edpica se ilustra a continuaci\u00f3n:\n\nCPU 0 (limpieza) | CPU 1 (retrollamada de trabajo retrasado)\ncnic_netdev_event() |\n  cnic_stop_hw() | cnic_delete_task()\n    cnic_cm_stop_bnx2x_hw() | ...\n      cancel_delayed_work() | /* el queue_delayed_work()\n      flush_workqueue() |    se ejecuta despu\u00e9s de flush_workqueue()*/\n                             | queue_delayed_work()\n  cnic_free_dev(dev)//liberar | cnic_delete_task() //nueva instancia\n                             |   dev = cp-\u003edev; //uso\n\nReemplace cancel_delayed_work() con cancel_delayed_work_sync() para asegurar que el elemento de trabajo retrasado c\u00edclico se cancele correctamente y que cualquier ejecuci\u00f3n en curso del elemento de trabajo se complete antes de que el cnic_dev sea desasignado. Adem\u00e1s, dado que cancel_delayed_work_sync() utiliza __flush_work(work, true) para esperar sincr\u00f3nicamente a que finalice cualquier instancia en ejecuci\u00f3n del elemento de trabajo, el flush_workqueue() se vuelve redundante y debe ser eliminado.\n\nEste error fue identificado mediante an\u00e1lisis est\u00e1tico. Para reproducir el problema y validar la correcci\u00f3n, simul\u00e9 el dispositivo PCI cnic en QEMU e introduje retrasos intencionales \u2014 como insertar llamadas a ssleep() dentro de la funci\u00f3n cnic_delete_task() \u2014 para aumentar la probabilidad de activar el error."
    }
  ],
  "id": "CVE-2025-39945",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
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          "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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          "baseScore": 7.8,
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          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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        "ssvcData": {
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          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-10T20:41:21.785248Z",
          "version": "2.0.3"
        }
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  },
  "published": "2025-10-04T08:15:47.613",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
        }
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      "source": "nvd@nist.gov",
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}

CVE-2025-39945 (GCVE-0-2025-39945)

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-08-05 12:06

Title

cnic: Fix use-after-free bugs in cnic_delete_task

Summary

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 2026-06-10 20:41 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/fde6e73189f40ebcf…
https://git.kernel.org/stable/c/7b6a5b0a6b392263c…
https://git.kernel.org/stable/c/0405055930264ea8f…
https://git.kernel.org/stable/c/e1fcd4a9c09feac09…
https://git.kernel.org/stable/c/8eeb2091e72d75df8…
https://git.kernel.org/stable/c/6e33a7eed587062ca…
https://git.kernel.org/stable/c/0627e1481676669ca…
https://git.kernel.org/stable/c/cfa7d9b1e3a8604af…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fdf24086f4752aee5dfb40143c736250df017820 , < fde6e73189f40ebcf0633aed2b68e731c25f3aa3 (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < 7b6a5b0a6b392263c3767fc945b311ea04b34bbd (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < 0405055930264ea8fd26f4131466fa7652e5e47d (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < e1fcd4a9c09feac0902a65615e866dbf22616125 (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < 8eeb2091e72d75df8ceaa2172638d61b4cf8929a (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < 6e33a7eed587062ca8161ad1f4584882a860d697 (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < 0627e1481676669cae2df0d85b5ff13e7d24c390 (git) Affected: fdf24086f4752aee5dfb40143c736250df017820 , < cfa7d9b1e3a8604afc84e9e51d789c29574fb216 (git)
Linux	Linux	Affected: 2.6.37 Unaffected: 0 , < 2.6.37 (semver) Unaffected: 5.4.300 , ≤ 5.4.* (semver) Unaffected: 5.10.245 , ≤ 5.10.* (semver) Unaffected: 5.15.194 , ≤ 5.15.* (semver) Unaffected: 6.1.154 , ≤ 6.1.* (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-39945",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:41:21.785248Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-11T18:44:11.566Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/cnic.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fde6e73189f40ebcf0633aed2b68e731c25f3aa3",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "7b6a5b0a6b392263c3767fc945b311ea04b34bbd",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "0405055930264ea8fd26f4131466fa7652e5e47d",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "e1fcd4a9c09feac0902a65615e866dbf22616125",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "8eeb2091e72d75df8ceaa2172638d61b4cf8929a",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "6e33a7eed587062ca8161ad1f4584882a860d697",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "0627e1481676669cae2df0d85b5ff13e7d24c390",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            },
            {
              "lessThan": "cfa7d9b1e3a8604afc84e9e51d789c29574fb216",
              "status": "affected",
              "version": "fdf24086f4752aee5dfb40143c736250df017820",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/cnic.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.37"
            },
            {
              "lessThan": "2.6.37",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.300",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.245",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.194",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.300",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.245",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.194",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.154",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.108",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.49",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.9",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncnic: Fix use-after-free bugs in cnic_delete_task\n\nThe original code uses cancel_delayed_work() in cnic_cm_stop_bnx2x_hw(),\nwhich does not guarantee that the delayed work item \u0027delete_task\u0027 has\nfully completed if it was already running. Additionally, the delayed work\nitem is cyclic, the flush_workqueue() in cnic_cm_stop_bnx2x_hw() only\nblocks and waits for work items that were already queued to the\nworkqueue prior to its invocation. Any work items submitted after\nflush_workqueue() is called are not included in the set of tasks that the\nflush operation awaits. This means that after the cyclic work items have\nfinished executing, a delayed work item may still exist in the workqueue.\nThis leads to use-after-free scenarios where the cnic_dev is deallocated\nby cnic_free_dev(), while delete_task remains active and attempt to\ndereference cnic_dev in cnic_delete_task().\n\nA typical race condition is illustrated below:\n\nCPU 0 (cleanup)              | CPU 1 (delayed work callback)\ncnic_netdev_event()          |\n  cnic_stop_hw()             | cnic_delete_task()\n    cnic_cm_stop_bnx2x_hw()  | ...\n      cancel_delayed_work()  | /* the queue_delayed_work()\n      flush_workqueue()      |    executes after flush_workqueue()*/\n                             | queue_delayed_work()\n  cnic_free_dev(dev)//free   | cnic_delete_task() //new instance\n                             |   dev = cp-\u003edev; //use\n\nReplace cancel_delayed_work() with cancel_delayed_work_sync() to ensure\nthat the cyclic delayed work item is properly canceled and that any\nongoing execution of the work item completes before the cnic_dev is\ndeallocated. Furthermore, since cancel_delayed_work_sync() uses\n__flush_work(work, true) to synchronously wait for any currently\nexecuting instance of the work item to finish, the flush_workqueue()\nbecomes redundant and should be removed.\n\nThis bug was identified through static analysis. To reproduce the issue\nand validate the fix, I simulated the cnic PCI device in QEMU and\nintroduced intentional delays \u2014 such as inserting calls to ssleep()\nwithin the cnic_delete_task() function \u2014 to increase the likelihood\nof triggering the bug."
        }
      ],
      "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 vulnerable teardown path is reached only through local administrative operations on the netdev (link down, MTU/ring change, driver unbind, netns move) and local iSCSI/FCoE offload management; no remotely supplied data reaches `cnic_cm_stop_bnx2x_hw()` or `cnic_delete_task()`.\nAC:L - The attacker controls both sides of the race \u2014 issuing iSCSI/FCoE connection destroys keeps `delete_task` in its 10 ms self-requeue cycle for the entire 2-second grace window while the interface-down is triggered, giving hundreds of attempts per try, and holding the cnic UIO chardev open stretches `cnic_stop_hw()`\u0027s wait loop to 1.5 s to widen the window further.\nPR:L - In the delegated-NIC container deployment, a bnx2x port placed into a network namespace lets a user-namespace-root (unprivileged host user) with `CAP_NET_ADMIN` over that netns drive `NETDEV_GOING_DOWN` and, via netns teardown/device migration, the `NETDEV_UNREGISTER` that reaches `cnic_free_dev()` \u2014 so no real host root is needed for the free side.\nUI:N - The attacker performs both the connection-destroy activity and the interface teardown; no victim action or cooperation is required at any point.\nS:U - The use-after-free corrupts kernel slab memory and is exploited within the kernel\u0027s own security authority, with no crossing of a hypervisor, IOMMU, or sandbox boundary.\nC:H - The freed `cnic_dev`/`cnic_local` chunk and `cp-\u003ectx_tbl` can be reclaimed by attacker-sprayed data, and the surviving work reads function pointers, DMA addresses, and ULP handles out of that freed memory, giving a path to disclose arbitrary kernel memory.\nI:H - `cnic_delete_task()` performs `test_and_clear_bit()` writes into the freed `ctx_tbl`, `kfree()`s pointers read from freed memory (arbitrary-free primitive), and makes an indirect call through `cp-\u003eethdev-\u003edrv_ctl` located in the freed allocation \u2014 a control-flow hijack primitive after heap grooming.\nA:H - The stale `delayed_work` timer is armed on `kfree()`d memory and the callback dereferences freed structures, so even an unsuccessful exploitation attempt reliably produces slab corruption, an oops, or a kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:20.222Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fde6e73189f40ebcf0633aed2b68e731c25f3aa3"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b6a5b0a6b392263c3767fc945b311ea04b34bbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/0405055930264ea8fd26f4131466fa7652e5e47d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1fcd4a9c09feac0902a65615e866dbf22616125"
        },
        {
          "url": "https://git.kernel.org/stable/c/8eeb2091e72d75df8ceaa2172638d61b4cf8929a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e33a7eed587062ca8161ad1f4584882a860d697"
        },
        {
          "url": "https://git.kernel.org/stable/c/0627e1481676669cae2df0d85b5ff13e7d24c390"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfa7d9b1e3a8604afc84e9e51d789c29574fb216"
        }
      ],
      "title": "cnic: Fix use-after-free bugs in cnic_delete_task",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39945",
    "datePublished": "2025-10-04T07:31:07.109Z",
    "dateReserved": "2025-04-16T07:20:57.148Z",
    "dateUpdated": "2026-08-05T12:06:20.222Z",
    "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

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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.

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