---
title: "CVE-2026-90347: Linux Kernel arm64 - Authentication Bypass"
description: "Linux kernel arm64 contains a broken authentication caused by incomplete synchronization of 'orig_x0' with 'x0' during syscall entry tracing, letting ptrace tracers manipulate syscall arguments bypassing seccomp and audit checks, exploit requires ptrace capability."
url: https://panop.io/threat-heartbeat/CVE-2026-90347/
---

# CVE-2026-90347 Linux Kernel arm64 - Authentication Bypass

Linux kernel arm64 contains a broken authentication caused by incomplete synchronization of 'orig\_x0' with 'x0' during syscall entry tracing, letting ptrace tracers manipulate syscall arguments bypassing seccomp and audit checks, exploit requires ptrace capability.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90347)

## Details

Type

Authentication Bypass

Impact

Privilege Escalation

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the Linux kernel version containing commit e057b9477232 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90347](https://nvd.nist.gov/vuln/detail/CVE-2026-90347)
- [https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde](https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde)
- [https://git.kernel.org/stable/c/e9e2854fcff5733ffc607e8ecc87e0e591ab41fd](https://git.kernel.org/stable/c/e9e2854fcff5733ffc607e8ecc87e0e591ab41fd)
- [https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572](https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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