Vulnerability-Lookup

FKIE_CVE-2026-68152

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 05:18

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: amt: fix use-after-free in AMT delayed works When an AMT device is removed, pending delayed works can still access the freed amt_dev structure, which may result in kernel crashes or memory corruption. amt_dev_stop() cancels req_wq and discovery_wq with cancel_delayed_work_sync(), but these works can be scheduled again from event_wq after the cancellation. This allows delayed works to access the freed amt_dev structure after the netdev has been released. The following is a simple race scenario: CPU0 CPU1 amt_dev_stop() cancel_delayed_work_sync() amt_event_work() mod_delayed_work(req_wq) free netdev req_wq accesses freed amt_dev Use disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and discovery_wq from being queued again and wait for running work items to complete. The delayed works are disabled after initialization in amt_newlink() and enabled only when the device is successfully opened. This keeps the delayed work lifecycle synchronized with the lifetime of the AMT device.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/006340cf06881b6ff49767d8b6f3c4f7b892670c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1a644db2cf59f164cdf3c75995bab5aadc097528
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ea20c44935d6142daecfa9b39d635033a7553e1b

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/amt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "1a644db2cf59f164cdf3c75995bab5aadc097528",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "006340cf06881b6ff49767d8b6f3c4f7b892670c",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "ea20c44935d6142daecfa9b39d635033a7553e1b",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/amt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "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\namt: fix use-after-free in AMT delayed works\n\nWhen an AMT device is removed, pending delayed works can still access\nthe freed amt_dev structure, which may result in kernel crashes or\nmemory corruption.\n\namt_dev_stop() cancels req_wq and discovery_wq with\ncancel_delayed_work_sync(), but these works can be scheduled again\nfrom event_wq after the cancellation. This allows delayed works to\naccess the freed amt_dev structure after the netdev has been released.\n\nThe following is a simple race scenario:\n\nCPU0                         CPU1\n\namt_dev_stop()\ncancel_delayed_work_sync()\n                             amt_event_work()\n                             mod_delayed_work(req_wq)\nfree netdev\n                             req_wq accesses freed amt_dev\n\nUse disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and\ndiscovery_wq from being queued again and wait for running work items\nto complete.\n\nThe delayed works are disabled after initialization in\namt_newlink() and enabled only when the device is successfully opened.\nThis keeps the delayed work lifecycle synchronized with the lifetime\nof the AMT device."
    }
  ],
  "id": "CVE-2026-68152",
  "lastModified": "2026-08-17T05:18:15.397",
  "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": "2026-08-10T13:20:01.290",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/006340cf06881b6ff49767d8b6f3c4f7b892670c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a644db2cf59f164cdf3c75995bab5aadc097528"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea20c44935d6142daecfa9b39d635033a7553e1b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-68152 (GCVE-0-2026-68152)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-17 04:59

Title

amt: fix use-after-free in AMT delayed works

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

References

4 references

URL	Tags
https://git.kernel.org/stable/c/a46bfa01e01df0f6f…
https://git.kernel.org/stable/c/1a644db2cf59f164c…
https://git.kernel.org/stable/c/006340cf06881b6ff…
https://git.kernel.org/stable/c/ea20c44935d6142da…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cbc21dc1cfe949e37b2a54c71511579f1899e8d4 , < a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2 (git) Affected: cbc21dc1cfe949e37b2a54c71511579f1899e8d4 , < 1a644db2cf59f164cdf3c75995bab5aadc097528 (git) Affected: cbc21dc1cfe949e37b2a54c71511579f1899e8d4 , < 006340cf06881b6ff49767d8b6f3c4f7b892670c (git) Affected: cbc21dc1cfe949e37b2a54c71511579f1899e8d4 , < ea20c44935d6142daecfa9b39d635033a7553e1b (git)
Linux	Linux	Affected: 5.16 Unaffected: 0 , < 5.16 (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 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/amt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "1a644db2cf59f164cdf3c75995bab5aadc097528",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "006340cf06881b6ff49767d8b6f3c4f7b892670c",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            },
            {
              "lessThan": "ea20c44935d6142daecfa9b39d635033a7553e1b",
              "status": "affected",
              "version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/amt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "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": "6.12.101",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\namt: fix use-after-free in AMT delayed works\n\nWhen an AMT device is removed, pending delayed works can still access\nthe freed amt_dev structure, which may result in kernel crashes or\nmemory corruption.\n\namt_dev_stop() cancels req_wq and discovery_wq with\ncancel_delayed_work_sync(), but these works can be scheduled again\nfrom event_wq after the cancellation. This allows delayed works to\naccess the freed amt_dev structure after the netdev has been released.\n\nThe following is a simple race scenario:\n\nCPU0                         CPU1\n\namt_dev_stop()\ncancel_delayed_work_sync()\n                             amt_event_work()\n                             mod_delayed_work(req_wq)\nfree netdev\n                             req_wq accesses freed amt_dev\n\nUse disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and\ndiscovery_wq from being queued again and wait for running work items\nto complete.\n\nThe delayed works are disabled after initialization in\namt_newlink() and enabled only when the device is successfully opened.\nThis keeps the delayed work lifecycle synchronized with the lifetime\nof the AMT device."
        }
      ],
      "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 - Exploitation requires triggering amt_dev_stop() via local rtnetlink (RTM_DELLINK/ip link del) or ndo_stop on an AMT gateway netdev; the UAF race in teardown is not reachable by remote UDP alone without this privileged local device-removal path.\nAC:L - The attacker controls both sides of the race by concurrently deleting/bringing down the AMT interface while flooding AMT UDP packets or letting discovery/request timers fire, reliably re-queuing req_wq/discovery_wq via amt_event_work during the cancel_work_sync window.\nPR:L - Creating, opening, and removing AMT virtual interfaces requires CAP_NET_ADMIN via rtnetlink, which unprivileged users can obtain inside a user network namespace (unshare -Urn), but not without any privileges at all.\nUI:N - No victim user interaction is required; a single attacker with namespace CAP_NET_ADMIN can create an AMT gateway, bring it up, and race interface teardown against self-generated AMT traffic or delayed-work events.\nS:U - Successful exploitation corrupts kernel heap memory and can escalate privileges within the same kernel, but does not inherently cross VM, container, or IOMMU security boundaries into a separate authority domain.\nC:H - Use-after-free of the amt_dev structure embedded in netdev private data allows accessing attacker-influenced freed heap memory, enabling arbitrary kernel memory disclosure through standard UAF exploitation techniques.\nI:H - The UAF on amt_dev delayed-work handlers can corrupt kernel heap metadata and adjacent objects, providing primitives for arbitrary kernel memory writes and potential code execution as acknowledged in the fix commit.\nA:H - Use-after-free in amt_req_work/amt_discovery_work accessing freed amt_dev during netdev teardown can cause kernel oops, panic, or hang, and the fix commit explicitly warns of kernel crashes and memory corruption."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:59:47.614Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a644db2cf59f164cdf3c75995bab5aadc097528"
        },
        {
          "url": "https://git.kernel.org/stable/c/006340cf06881b6ff49767d8b6f3c4f7b892670c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea20c44935d6142daecfa9b39d635033a7553e1b"
        }
      ],
      "title": "amt: fix use-after-free in AMT delayed works",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68152",
    "datePublished": "2026-08-10T11:59:18.270Z",
    "dateReserved": "2026-07-30T09:28:09.371Z",
    "dateUpdated": "2026-08-17T04:59:47.614Z",
    "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.

Action not permitted

FKIE_CVE-2026-68152

CVE-2026-68152 (GCVE-0-2026-68152)

Tags

Sightings

Nomenclature