Vulnerability-Lookup

FKIE_CVE-2026-74661

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: mac802154: fix netdev use-after-free in beacon worker mac802154_beacon_worker() reads local->beacon_req under RCU and derives the sub-interface from the request, but then drops the RCU read lock and continues to use both sdata and the embedded wpan_dev. mac802154_stop_beacons_locked() cancels only pending beacon work, clears local->beacon_req and frees the request. A beacon worker that is already running can therefore continue after interface teardown and dereference the freed netdev private area. The scan worker already pins the netdev before leaving RCU. Apply the same lifetime rule to the beacon worker: take a netdev reference while the request is still protected by RCU, and release it on all paths that continue after the reference is acquired.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e5fb0e03bc7f45508c182a427357bf6b389a9033",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e6cd416a899edc912b428c4ba399bd73f516cb31",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "9d067e581597c462c51fee8a30b51bc48a68c4e1",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "5f26a690e8efa54315e4922368daf54e0b8f5515",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "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\nmac802154: fix netdev use-after-free in beacon worker\n\nmac802154_beacon_worker() reads local-\u003ebeacon_req under RCU and derives\nthe sub-interface from the request, but then drops the RCU read lock and\ncontinues to use both sdata and the embedded wpan_dev.\n\nmac802154_stop_beacons_locked() cancels only pending beacon work, clears\nlocal-\u003ebeacon_req and frees the request.  A beacon worker that is already\nrunning can therefore continue after interface teardown and dereference\nthe freed netdev private area.\n\nThe scan worker already pins the netdev before leaving RCU.  Apply the\nsame lifetime rule to the beacon worker: take a netdev reference while\nthe request is still protected by RCU, and release it on all paths that\ncontinue after the reference is acquired."
    }
  ],
  "id": "CVE-2026-74661",
  "lastModified": "2026-08-25T06:18:47.263",
  "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": "2026-08-22T16:16:39.883",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74661 (GCVE-0-2026-74661)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41

Title

mac802154: fix netdev use-after-free in beacon worker

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

5 references

URL	Tags
https://git.kernel.org/stable/c/fe820dcc1d8ff7778…
https://git.kernel.org/stable/c/e5fb0e03bc7f45508…
https://git.kernel.org/stable/c/e6cd416a899edc912…
https://git.kernel.org/stable/c/9d067e581597c462c…
https://git.kernel.org/stable/c/5f26a690e8efa5431…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3accf4762734a69ebd03cba989249c78ac7dfc7e , < fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517 (git) Affected: 3accf4762734a69ebd03cba989249c78ac7dfc7e , < e5fb0e03bc7f45508c182a427357bf6b389a9033 (git) Affected: 3accf4762734a69ebd03cba989249c78ac7dfc7e , < e6cd416a899edc912b428c4ba399bd73f516cb31 (git) Affected: 3accf4762734a69ebd03cba989249c78ac7dfc7e , < 9d067e581597c462c51fee8a30b51bc48a68c4e1 (git) Affected: 3accf4762734a69ebd03cba989249c78ac7dfc7e , < 5f26a690e8efa54315e4922368daf54e0b8f5515 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.152 , ≤ 6.6.* (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": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e5fb0e03bc7f45508c182a427357bf6b389a9033",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e6cd416a899edc912b428c4ba399bd73f516cb31",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "9d067e581597c462c51fee8a30b51bc48a68c4e1",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "5f26a690e8efa54315e4922368daf54e0b8f5515",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "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": "6.6.152",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix netdev use-after-free in beacon worker\n\nmac802154_beacon_worker() reads local-\u003ebeacon_req under RCU and derives\nthe sub-interface from the request, but then drops the RCU read lock and\ncontinues to use both sdata and the embedded wpan_dev.\n\nmac802154_stop_beacons_locked() cancels only pending beacon work, clears\nlocal-\u003ebeacon_req and frees the request.  A beacon worker that is already\nrunning can therefore continue after interface teardown and dereference\nthe freed netdev private area.\n\nThe scan worker already pins the netdev before leaving RCU.  Apply the\nsame lifetime rule to the beacon worker: take a netdev reference while\nthe request is still protected by RCU, and release it on all paths that\ncontinue after the reference is acquired."
        }
      ],
      "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 local nl802154 generic-netlink syscalls (NL802154_CMD_SEND_BEACONS/STOP_BEACONS) or closing the wpan netdev; the UAF is in beacon workqueue teardown, not in remote 802.15.4 frame parsing, matching netlink-local kernel guidance.\nAC:L - An attacker with CAP_NET_ADMIN controls both sides of the race by starting beaconing then immediately issuing STOP_BEACONS or DEL_INTERFACE while mac802154_transmit_beacon() keeps the worker running; cancel_delayed_work() does not stop in-flight work, making the UAF reliably triggerable.\nPR:L - Starting/stopping beaconing and deleting wpan interfaces require GENL_ADMIN_PERM (netlink_capable CAP_NET_ADMIN); this is reachable from an unprivileged UID via a user namespace (unshare -Urn), not init-namespace root, consistent with mac802154_hwsim and nl802154 gating.\nUI:N - No victim interaction is required; the attacker triggers the race entirely through their own netlink and interface lifecycle operations without needing another user to click, pair, or mount anything.\nS:U - The use-after-free corrupts kernel heap memory (netdev private ieee802154_sub_if_data) within the same kernel security boundary; it does not cross VM, container, or IOMMU isolation boundaries on its own.\nC:H - Use-after-free of the netdev private area (ieee802154_sub_if_data) after interface teardown allows reading freed slab memory; UAF primitives commonly enable arbitrary kernel memory disclosure via heap grooming.\nI:H - The dangling sdata/wpan_dev pointers enable heap-based memory corruption; UAF of netdev private structures is exploitable for control-flow hijacking and arbitrary kernel write primitives via slab reuse.\nA:H - Concurrent interface teardown while the beacon worker dereferences freed netdev private memory causes kernel oops/panic (KASAN slab-use-after-free), and successful exploitation can crash or hang the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:15.528Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515"
        }
      ],
      "title": "mac802154: fix netdev use-after-free in beacon worker",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74661",
    "datePublished": "2026-08-22T15:32:34.414Z",
    "dateReserved": "2026-08-15T05:44:03.924Z",
    "dateUpdated": "2026-08-25T05:41:15.528Z",
    "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.

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FKIE_CVE-2026-74661

CVE-2026-74661 (GCVE-0-2026-74661)

Tags

Sightings

Nomenclature