CVE-2026-43421

MEDIUM EPSS 2.4%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

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/

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥3.11  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/85acaba2f42b557499bab3608307f17bf13beb69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93f116c3393a22acab96ad1bef12b2572eb80ca4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec35c1969650e7cb6c8a91020e568ed46e3551b0
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/85acaba2f42b557499bab3608307f17bf13beb69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93f116c3393a22acab96ad1bef12b2572eb80ca4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec35c1969650e7cb6c8a91020e568ed46e3551b0
    Patch