CVE-2026-43424

MEDIUM EPSS 2.4%

Published May 8, 20261mo ago · Modified Jun 17, 20262w ago

5.5 CVSS 3.1

Medium

Published May 8, 2026 1mo ago

Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score

5.5

Exploitability

1.8

Impact

3.6

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector Local

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

2.4% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 10

Vendor	Product	Version	Range
linux	linux_kernel	*	≥3.5 – <5.10.253
linux	linux_kernel	*	≥5.11 – <6.1.167
linux	linux_kernel	*	≥6.2 – <6.6.130
linux	linux_kernel	*	≥6.7 – <6.12.78
linux	linux_kernel	*	≥6.13 – <6.18.19
linux	linux_kernel	*	≥6.19 – <6.19.9
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any

References 7

git.kernel.org https://git.kernel.org/stable/c/2a2ef846a54a06c33b5c2d4b0d918583e1e7c0b7

Patch
git.kernel.org https://git.kernel.org/stable/c/3d309b37633c4a847fc149939a2c9576f1aa1065

Patch
git.kernel.org https://git.kernel.org/stable/c/679d9535aeb15c10bce89c44102004b96624d706

Patch
git.kernel.org https://git.kernel.org/stable/c/b9b26d7f3aa288cfa54a7bc68612bab1f153f156

Patch
git.kernel.org https://git.kernel.org/stable/c/b9fde507355342a2d64225d582dc8b98ff5ecb19

Patch
git.kernel.org https://git.kernel.org/stable/c/d146f27758049fa55ae4c53785a852d3cf7a18d6

Patch
git.kernel.org https://git.kernel.org/stable/c/f962ca3b020e13d6714f27e8c36fe742441c58d1

Patch

Remediation

git.kernel.org https://git.kernel.org/stable/c/2a2ef846a54a06c33b5c2d4b0d918583e1e7c0b7

Patch
git.kernel.org https://git.kernel.org/stable/c/3d309b37633c4a847fc149939a2c9576f1aa1065

Patch
git.kernel.org https://git.kernel.org/stable/c/679d9535aeb15c10bce89c44102004b96624d706

Patch
git.kernel.org https://git.kernel.org/stable/c/b9b26d7f3aa288cfa54a7bc68612bab1f153f156

Patch
git.kernel.org https://git.kernel.org/stable/c/b9fde507355342a2d64225d582dc8b98ff5ecb19

Patch
git.kernel.org https://git.kernel.org/stable/c/d146f27758049fa55ae4c53785a852d3cf7a18d6

Patch
git.kernel.org https://git.kernel.org/stable/c/f962ca3b020e13d6714f27e8c36fe742441c58d1

Patch