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🛡️ CVE-2026-43424 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

usb: gadget: f_tcm: Fix NULL pointer dereferences in nexus handling

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

usb: gadget: f_tcm: Fix NULL pointer dereferences in nexus handling

The tpg->tpg_nexus pointer in the USB Target driver is dynamically

managed and tied to userspace configuration via ConfigFS. It can be

NULL if the USB host sends requests before the nexus is fully

established or immediately after it is dropped.

Currently, functions like bot_submit_command() and the data

transfer paths retrieve tv_nexus = tpg->tpg_nexus and immediately

dereference tv_nexus->tvn_se_sess without any validation. If a

malicious or misconfigured USB host sends a BOT (Bulk-Only Transport)

command during this race window, it triggers a NULL pointer

dereference, leading to a kernel panic (local DoS).

This exposes an inconsistent API usage within the module, as peer

functions like usbg_submit_command() and bot_send_bad_response()

correctly implement a NULL check for tv_nexus before proceeding.

Fix this by bringing consistency to the nexus handling. Add the

missing if (!tv_nexus) checks to the vulnerable BOT command and

request processing paths, aborting the command gracefully with an

error instead of crashing the system.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-43424 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.9)
  • linux-kernel

Timeline and source

Published on 8 May 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43424 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-08
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.9
linux-kernel — —

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