usb: gadget: f_ncm: Fix net_device lifecycle with device_move

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Summary

CVECVE-2026-43421
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:54 UTC
Updated2026-05-12 14:10:27 UTC
DescriptionIn 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/[email protected]/ [2] https://lore.kernel.org/linux-usb/[email protected]/

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.047270000 (date 2026-05-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 40d133d7f542616cf9538508a372306e626a16e9 93f116c3393a22acab96ad1bef12b2572eb80ca4 git Not specified
CNA Linux Linux affected 40d133d7f542616cf9538508a372306e626a16e9 e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d git Not specified
CNA Linux Linux affected 40d133d7f542616cf9538508a372306e626a16e9 85acaba2f42b557499bab3608307f17bf13beb69 git Not specified
CNA Linux Linux affected 40d133d7f542616cf9538508a372306e626a16e9 ec35c1969650e7cb6c8a91020e568ed46e3551b0 git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/93f116c3393a22acab96ad1bef12b2572eb80ca4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec35c1969650e7cb6c8a91020e568ed46e3551b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/85acaba2f42b557499bab3608307f17bf13beb69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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