CVE-2021-47648

Service interruption via host1x removal memory leak

Published Feb 26, 2025 · Updated May 11, 2026

Memory leakage in the host1x GPU driver in affected Linux versions allows local users to exhaust kernel memory during device removal. host1x_remove() omits host1x_channel_list_free(), leaving the driver's allocated channel list unreleased when the device is torn down. The published record does not explain how a low-privileged user reaches removal; repeated teardown can deplete memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the host1x GPU driver in affected Linux versions allows local users to exhaust kernel memory during device removal. host1x_remove() omits host1x_channel_list_free(), leaving the driver's allocated channel list unreleased when the device is torn down. The published record does not explain how a low-privileged user reaches removal; repeated teardown can deplete memory and interrupt service.

The record

CVE
CVE-2021-47648
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.13
  2. Affected versionversion=8474b02531c4881a762c52ef869c52429e38633f <025c6643a81564f066d8381b9e2f4603e0f8438f
  3. Affected versionversion=8474b02531c4881a762c52ef869c52429e38633f <5124a344983e1b9670dae7add0e4d00d589aabcd
  4. Affected versionversion=8474b02531c4881a762c52ef869c52429e38633f <6bb107332db28a0e9256c2d36a0902b85307612c
  5. Affected versionversion=8474b02531c4881a762c52ef869c52429e38633f <c06577a80485511b894cb688e881ef0bc2d1d296
  6. Affected versionversion=8474b02531c4881a762c52ef869c52429e38633f <fe1ce680560d4f0049ffa0c687de17567421c1ec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=8474b02531c4881a762c52ef869c52429e38633f <025c6643a81564f066d8381b9e2f4603e0f8438f; version=8474b02531c4881a762c52ef869c52429e38633f <5124a344983e1b9670dae7add0e4d00d589aabcd; version=8474b02531c4881a762c52ef869c52429e38633f <6bb107332db28a0e9256c2d36a0902b85307612c; version=8474b02531c4881a762c52ef869c52429e38633f <c06577a80485511b894cb688e881ef0bc2d1d296; version=8474b02531c4881a762c52ef869c52429e38633f <fe1ce680560d4f0049ffa0c687de17567421c1ec

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

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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