CVE-2026-43421 (GCVE-0-2026-43421)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-10-15 01:19
VLAI
Title
usb: gadget: f_ncm: Fix net_device lifecycle with device_move
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Fix net_device lifecycle with device_move The network device outlived its parent gadget device during disconnection, resulting in dangling sysfs links and null pointer dereference problems. A prior attempt to solve this by removing SET_NETDEV_DEV entirely [1] was reverted due to power management ordering concerns and a NO-CARRIER regression. A subsequent attempt to defer net_device allocation to bind [2] broke 1:1 mapping between function instance and network device, making it impossible for configfs to report the resolved interface name. This results in a regression where the DHCP server fails on pmOS. Use device_move to reparent the net_device between the gadget device and /sys/devices/virtual/ across bind/unbind cycles. This preserves the network interface across USB reconnection, allowing the DHCP server to retain their binding. Introduce gether_attach_gadget()/gether_detach_gadget() helpers and use __free(detach_gadget) macro to undo attachment on bind failure. The bind_count ensures device_move executes only on the first bind. [1] https://lore.kernel.org/lkml/f2a4f9847617a0929d62025748384092e5f35cce.camel@crapouillou.net/ [2] https://lore.kernel.org/linux-usb/795ea759-7eaf-4f78-81f4-01ffbf2d7961@ixit.cz/
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6794 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < 7c97366f5dac5255e60a317ffe3a5b18f3745547 (git)
Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < 36c41e9724c9a7a7cda37f5a4e9d94f25c8031c4 (git)
Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < 93f116c3393a22acab96ad1bef12b2572eb80ca4 (git)
Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d (git)
Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < 85acaba2f42b557499bab3608307f17bf13beb69 (git)
Affected: 40d133d7f542616cf9538508a372306e626a16e9 , < ec35c1969650e7cb6c8a91020e568ed46e3551b0 (git)
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Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Show details on NVD website
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          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T06:06:15+00:00",
      "cve": "CVE-2026-43421",
      "id": "CVE-2026-43421",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "77",
      "product_status:known_not_affected": "199",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_ncm: Fix net_device lifecycle with device_move",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43421.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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