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.
References
Configurations
Configuration 1 (hide)
|
History
20 May 2026, 18:37
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/2a2ef846a54a06c33b5c2d4b0d918583e1e7c0b7 - Patch | |
| References | () https://git.kernel.org/stable/c/3d309b37633c4a847fc149939a2c9576f1aa1065 - Patch | |
| References | () https://git.kernel.org/stable/c/679d9535aeb15c10bce89c44102004b96624d706 - Patch | |
| References | () https://git.kernel.org/stable/c/b9b26d7f3aa288cfa54a7bc68612bab1f153f156 - Patch | |
| References | () https://git.kernel.org/stable/c/b9fde507355342a2d64225d582dc8b98ff5ecb19 - Patch | |
| References | () https://git.kernel.org/stable/c/d146f27758049fa55ae4c53785a852d3cf7a18d6 - Patch | |
| References | () https://git.kernel.org/stable/c/f962ca3b020e13d6714f27e8c36fe742441c58d1 - Patch | |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
08 May 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-08 15:16
Updated : 2026-05-20 18:37
NVD link : CVE-2026-43424
Mitre link : CVE-2026-43424
CVE.ORG link : CVE-2026-43424
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference