Skip to content
Heist/ feed
Unrated

usb: gadget: f_ncm: Fix net_device lifecycle with device_move

Type: advisorySource: Official CVE List1 source record

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/

Announced Source revision 1
Original source ↗

CVE-2026-43421

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43421

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "7c97366f5dac5255e60a317ffe3a5b18f3745547",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "36c41e9724c9a7a7cda37f5a4e9d94f25c8031c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "93f116c3393a22acab96ad1bef12b2572eb80ca4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "85acaba2f42b557499bab3608307f17bf13beb69",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "40d133d7f542616cf9538508a372306e626a16e9",
        "lessThan": "ec35c1969650e7cb6c8a91020e568ed46e3551b0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/usb/gadget/function/f_ncm.c",
      "drivers/usb/gadget/function/u_ether.c",
      "drivers/usb/gadget/function/u_ether.h",
      "drivers/usb/gadget/function/u_ncm.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/gadget/function/f_ncm.c",
      "drivers/usb/gadget/function/u_ether.c",
      "drivers/usb/gadget/function/u_ether.h",
      "drivers/usb/gadget/function/u_ncm.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43421

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28350 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement