CVE-2021-47610

System crash via stale error-pointer cleanup

Published Jun 19, 2024 · Updated Aug 11, 2026

A NULL pointer dereference in Linux kernel 5.15 allows local users to crash the system through the MSM GEM submit ioctl. When submission allocation returns an error pointer, msm_ioctl_gem_submit leaves it in submit, and cleanup passes it to kref_put instead of treating it as absent. Reaching the fault requires local low-privilege ioctl access and an allocation failure; successful triggering causes a kernel panic and service interruption.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in Linux kernel 5.15 allows local users to crash the system through the MSM GEM submit ioctl. When submission allocation returns an error pointer, msm_ioctl_gem_submit leaves it in submit, and cleanup passes it to kref_put instead of treating it as absent. Reaching the fault requires local low-privilege ioctl access and an allocation failure; successful triggering causes a kernel panic and service interruption.

The record

CVE
CVE-2021-47610
Published
Jun 19, 2024
Updated
Aug 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 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=5.15
  2. Affected versionversion=e3e24ee51ed2c4a5f46b1032b4be1a0a5da90c06 <26d776fd0f79f093a5d0ce1a4c7c7a992bc3264c
  3. Affected versionversion=e3e24ee51ed2c4a5f46b1032b4be1a0a5da90c06 <f6db3d98f876870c35e96693cfd54752f6199e59

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e3e24ee51ed2c4a5f46b1032b4be1a0a5da90c06 <26d776fd0f79f093a5d0ce1a4c7c7a992bc3264c; version=e3e24ee51ed2c4a5f46b1032b4be1a0a5da90c06 <f6db3d98f876870c35e96693cfd54752f6199e59

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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

CWE-476NULL Pointer Dereference
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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