# CVE-2026-43423: linux: In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: f_ncm: Fix atomic context locking i...

CVE-2026-43423 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43423 (version 6.19.10-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-43423
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 8, 2026

## Description

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  ...

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.10-1 | [DEBIAN-CVE-2026-43423](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43423.md) | May 15, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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