CVE-2022-49783

Local denial of service via unsafe FPU locking

Published May 1, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 5.16 through 6.0.9 allows local users to interrupt x86 PREEMPT_RT systems during process cloning. fpu_clone() calls fpu_inherit_perms() while fpregs_lock has disabled preemption, and the latter can acquire spin_lock_irq() on the dynamic FPU-state path. Low-privileged local code must reach that path while cloning; the record does not specify whether interruption is a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 5.16 through 6.0.9 allows local users to interrupt x86 PREEMPT_RT systems during process cloning. fpu_clone() calls fpu_inherit_perms() while fpregs_lock has disabled preemption, and the latter can acquire spin_lock_irq() on the dynamic FPU-state path. Low-privileged local code must reach that path while cloning; the record does not specify whether interruption is a hang, crash, or reboot.

The record

CVE
CVE-2022-49783
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.16
  2. Affected versionversion=9e798e9aa14c45fb94e47b30bf6347b369ce9df7 <36b038791e1e2baea892e9276588815fd14894b4
  3. Affected versionversion=9e798e9aa14c45fb94e47b30bf6347b369ce9df7 <c6e8a7a1780af3da65e78a615f7d0874da6aabb0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=9e798e9aa14c45fb94e47b30bf6347b369ce9df7 <36b038791e1e2baea892e9276588815fd14894b4; version=9e798e9aa14c45fb94e47b30bf6347b369ce9df7 <c6e8a7a1780af3da65e78a615f7d0874da6aabb0

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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