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CVE-2026-46246 high CVSS 7.8

Use-After-Free in Linux kernel (CVE-2026-46246)

Summary

Vulnerability in Linux kernel (CVE-2026-46246). Successful exploitation can lead to full system takeover. Exploitable via devm_.

Original description

The description as published by the source.

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

power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler

Using the devm_ variant for requesting IRQ before the devm_
variant for allocating/registering the extcon handle, means that the
extcon handle will be deallocated/unregistered before the interrupt
handler (since devm_ naturally deallocates in reverse allocation
order). This means that during removal, there is a race condition where
an interrupt can fire just after the extcon handle has been
freed, but just before the corresponding unregistration of the IRQ
handler has run.

This will lead to the IRQ handler calling extcon_set_state_sync() with
a freed extcon handle. Which usually crashes the system or otherwise
silently corrupts the memory...

Fix this racy use-after-free by making sure the IRQ is requested after
the registration of the extcon handle.

Source: GitHub Security Advisories (Global) 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-2026-46246 has been found in Linux kernel.
Attackers can target a specific entry point like devm_ over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-46246" on the vendor's site.

CVE-2026-46246 (Linux kernel) — CWE-416 / CVSS v3 7.8
Attack vector: local / no user interaction
Attack surface: devm_ / extcon
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.

❓ What is the problem

Use-after-free (CWE-416) exists in Linux kernel. Attackers reach the vulnerable code path via devm_.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel. Attack surface: devm_ / extcon.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

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

  1. 1
    Identify 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。

  2. 2
    Post-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

Linux Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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