CVE-2022-1671

System crash and kernel disclosure via unchecked callback

Published Jul 26, 2022 · Updated Aug 3, 2024

NULL pointer dereference in Linux Kernel before 5.18-rc1 allows local users to crash the system or read kernel memory via an ioctl. In net/rxrpc/server_key.c, rxrpc_preparse_s dispatches through the selected security class without checking whether its preparse_server_key callback is NULL. Any unprivileged local user able to issue the RxRPC server-key ioctl can trigger a system-wide crash; disclosure is limited to internal kernel information.

CVSS severity7.1
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel before 5.18-rc1 allows local users to crash the system or read kernel memory via an ioctl. In net/rxrpc/server_key.c, rxrpc_preparse_s dispatches through the selected security class without checking whether its preparse_server_key callback is NULL. Any unprivileged local user able to issue the RxRPC server-key ioctl can trigger a system-wide crash; disclosure is limited to internal kernel information.

The record

CVE
CVE-2022-1671
Published
Jul 26, 2022
Updated
Aug 3, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=Linux kernel version prior to kernel 5.18 rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel version prior to kernel 5.18 rc1

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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