Vulnerability in Linux kernel (CVE-2026-43424)
Summary
Vulnerability in Linux kernel (CVE-2026-43424). Risk of unauthorized operations or information disclosure. Exploitable via tv_nexus.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-43424 has been found in Linux kernel.
Attackers can target a specific entry point like tv_nexus over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-43424" on the vendor's site.
CVE-2026-43424 (Linux kernel) — CWE-476 / CVSS v3 5.5
Attack vector: local / no user interaction
Attack surface: tv_nexus
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-476) exists in Linux kernel. Attackers reach the vulnerable code path via tv_nexus.
Check the vendor advisory for the affected versions of Linux kernel. Attack surface: tv_nexus.
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-43424 linux-lts Fixed in: 6.1.167-r0
- Debian DEBIAN-CVE-2026-43424 linux Fixed in: 5.10.257-1
- Ubuntu UBUNTU-CVE-2026-43424 linux
References
- advisory nvd.nist.gov
- advisory github.com
- package 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 git.kernel.org
- web github.com