Vulnerability-Lookup

FKIE_CVE-2026-74725

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

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: enic: fix tx_hang_reset use-after-free on device removal enic_remove() cancels the reset and change_mtu_work items but does not cancel tx_hang_reset. A TX timeout that fires while the device is being removed can schedule enic_tx_hang_reset() so that it runs after free_netdev(), resulting in a use-after-free. cancel_work_sync() alone is not sufficient here: the still-live watchdog and notify paths can re-schedule these work items in the window between the cancel and unregister_netdev(). Use disable_work_sync(), which cancels the work and blocks any subsequent schedule_work() from requeuing it, and apply it to the reset and change_mtu_work items as well so the same requeue race is closed for all teardown work.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8619865f34fb3b130b567855382a5c4aadd522b9",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "e506e704b74748ffd0e1c92a7453ca2a959f832b",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "4f3464fc6c1f26afc504fd525c574f2bc14c9d42",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "ec680ea4ba1bca92a767fb7e7869758bfdd886e3",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nenic: fix tx_hang_reset use-after-free on device removal\n\nenic_remove() cancels the reset and change_mtu_work items but does not\ncancel tx_hang_reset. A TX timeout that fires while the device is being\nremoved can schedule enic_tx_hang_reset() so that it runs after\nfree_netdev(), resulting in a use-after-free.\n\ncancel_work_sync() alone is not sufficient here: the still-live watchdog\nand notify paths can re-schedule these work items in the window between\nthe cancel and unregister_netdev(). Use disable_work_sync(), which\ncancels the work and blocks any subsequent schedule_work() from\nrequeuing it, and apply it to the reset and change_mtu_work items as\nwell so the same requeue race is closed for all teardown work."
    }
  ],
  "id": "CVE-2026-74725",
  "lastModified": "2026-08-25T06:18:58.687",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:47.567",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74725 (GCVE-0-2026-74725)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:42

Title

enic: fix tx_hang_reset use-after-free on device removal

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/8619865f34fb3b130…
https://git.kernel.org/stable/c/e506e704b74748ffd…
https://git.kernel.org/stable/c/4f3464fc6c1f26afc…
https://git.kernel.org/stable/c/ec680ea4ba1bca92a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 937317c7c1097aa878a5000e3aab616eb5c590c0 , < 8619865f34fb3b130b567855382a5c4aadd522b9 (git) Affected: 937317c7c1097aa878a5000e3aab616eb5c590c0 , < e506e704b74748ffd0e1c92a7453ca2a959f832b (git) Affected: 937317c7c1097aa878a5000e3aab616eb5c590c0 , < 4f3464fc6c1f26afc504fd525c574f2bc14c9d42 (git) Affected: 937317c7c1097aa878a5000e3aab616eb5c590c0 , < ec680ea4ba1bca92a767fb7e7869758bfdd886e3 (git)
Linux	Linux	Affected: 4.4 Unaffected: 0 , < 4.4 (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8619865f34fb3b130b567855382a5c4aadd522b9",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "e506e704b74748ffd0e1c92a7453ca2a959f832b",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "4f3464fc6c1f26afc504fd525c574f2bc14c9d42",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            },
            {
              "lessThan": "ec680ea4ba1bca92a767fb7e7869758bfdd886e3",
              "status": "affected",
              "version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nenic: fix tx_hang_reset use-after-free on device removal\n\nenic_remove() cancels the reset and change_mtu_work items but does not\ncancel tx_hang_reset. A TX timeout that fires while the device is being\nremoved can schedule enic_tx_hang_reset() so that it runs after\nfree_netdev(), resulting in a use-after-free.\n\ncancel_work_sync() alone is not sufficient here: the still-live watchdog\nand notify paths can re-schedule these work items in the window between\nthe cancel and unregister_netdev(). Use disable_work_sync(), which\ncancels the work and blocks any subsequent schedule_work() from\nrequeuing it, and apply it to the reset and change_mtu_work items as\nwell so the same requeue race is closed for all teardown work."
        }
      ],
      "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 UAF occurs during enic_remove() PCI/driver teardown (sysfs unbind, rmmod, or hot-unplug); TX timeout is raised by the local netdev watchdog, not by remote packet processing, and there is no standalone network path into enic_remove itself.\nAC:L - This is a workqueue race during removal: once teardown starts the netdev can still be up so the watchdog schedules enic_tx_hang_reset, and an attacker can reliably drive TX timeout by stalling or flooding xmit on the still-registered interface while removal proceeds.\nPR:L - PCI unbind/module unload needs elevated privileges, but an unprivileged local or tenant workload can supply the concurrent netdev watchdog TX timeout (local/remote traffic on the Cisco VIC uplink) that schedules tx_hang_reset; per driver-removal UAF precedent, PR:L.\nUI:N - No victim interaction is required beyond routine driver removal, module unload, or hypervisor VNIC hot-unplug; monitoring and network traffic on the live interface can schedule tx_hang_reset during teardown without cooperation.\nS:U - Impact is use-after-free of netdev_priv enic memory in the host/guest kernel, enabling crash or privilege escalation within the same kernel security authority; it does not cross VM, hypervisor, IOMMU, or container boundaries.\nC:H - enic_tx_hang_reset dereferences freed enic/netdev memory via container_of(work, struct enic, tx_hang_reset); UAF on the unified netdev slab enables arbitrary kernel memory disclosure once the object is reallocated.\nI:H - The scheduled work performs hang reset, stop/open, and notifier calls through the dangling enic pointer, giving attacker-influenced writes and control-flow hijack primitives typical of netdev driver UAF exploitation.\nA:H - Use-after-free during enic_tx_hang_reset reliably causes kernel oops/panic when the work runs after free_netdev(), and even attempted exploitation crashes the system on dangling enic/netdev accesses."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:42:05.934Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3"
        }
      ],
      "title": "enic: fix tx_hang_reset use-after-free on device removal",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74725",
    "datePublished": "2026-08-22T15:33:16.460Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-25T05:42:05.934Z",
    "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.

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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FKIE_CVE-2026-74725

CVE-2026-74725 (GCVE-0-2026-74725)

Tags

Sightings

Nomenclature

Related by attack behaviour