usb: gadget: f_ncm: Fix net_device lifecycle with device_move
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.176, 6.6.143, 6.12.78, 6.18.19, 6.19.9
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
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/
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in 7c97366f5dac5255e60a317ffe3a5b18f3745547; From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in 36c41e9724c9a7a7cda37f5a4e9d94f25c8031c4; From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in 93f116c3393a22acab96ad1bef12b2572eb80ca4; From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d; From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in 85acaba2f42b557499bab3608307f17bf13beb69; From 40d133d7f542616cf9538508a372306e626a16e9 · fixed in ec35c1969650e7cb6c8a91020e568ed46e3551b0
- Linux Linux
3.11
- KernelLinux
From 3.11.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.19; From 6.19.0 · fixed in 6.19.9