CVE-2026-43423

Summary

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ncm: Fix atomic context locking issue

The ncm_set_alt function was holding a mutex to protect against races with configfs, which invokes the might-sleep function inside an atomic context.

Remove the struct net_device pointer from the f_ncm_opts structure to eliminate the contention. The connection state is now managed by a new boolean flag to preserve the use-after-free fix from commit 6334b8e4553c ("usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error").

BUG: sleeping function called from invalid context Call Trace: dump_stack_lvl+0x83/0xc0 dump_stack+0x14/0x16 __might_resched+0x389/0x4c0 __might_sleep+0x8e/0x100 … __mutex_lock+0x6f/0x1740 … ncm_set_alt+0x209/0xa40 set_config+0x6b6/0xb40 composite_setup+0x734/0x2b40 …

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3
• https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612
• https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68

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