CVE-2021-47104

Kernel memory exhaustion via leaked SDMA packets

Published Mar 4, 2024 · Updated May 23, 2026

Memory leak in the Linux kernel's qib InfiniBand driver allows local users to exhaust kernel memory through failed SDMA packet queuing. The qib_user_sdma_queue_pkts() error path jumps to a label that bypasses cleanup of its allocated packet structure. Access to a qib InfiniBand device and a packet-queueing error are required; repeated failures consume memory and can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel's qib InfiniBand driver allows local users to exhaust kernel memory through failed SDMA packet queuing. The qib_user_sdma_queue_pkts() error path jumps to a label that bypasses cleanup of its allocated packet structure. Access to a qib InfiniBand device and a packet-queueing error are required; repeated failures consume memory and can interrupt service.

The record

CVE
CVE-2021-47104
Published
Mar 4, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0d4395477741608d123dad51def9fe50b7ebe952
  2. Affected versionversion=0f8cdfff06829a0b0348b6debc29ff6a61967724 <79dcbd8176152b860028b62f81a635d987365752
  3. Affected versionversion=3f57c3f67fd93b4da86aeffea1ca32c484d054ad <76b648063eb36c72dfc0a6896de8a0a7d2c7841c
  4. Affected versionversion=4.14.255 <4.14.260
  5. Affected versionversion=4.19.216 <4.19.223
  6. Affected versionversion=4.4.292 <4.4.297
  7. Affected versionversion=4.9.290 <4.9.295
  8. Affected versionversion=5.10.77 <5.10.89
  9. Affected versionversion=5.14.16 <5.15
  10. Affected versionversion=5.15
  11. Affected versionversion=5.4.157 <5.4.169
  12. Affected versionversion=60833707b968d5ae02a75edb7886dcd4a957cf0d <d53456492b5d02033c73dfa0f3b94c86337791ba
  13. Affected versionversion=73d2892148aa4397a885b4f4afcfc5b27a325c42 <0aaec9c5f60754b56f84460ea439b8c5e91f4caa
  14. Affected versionversion=bda41654b6e0c125a624ca35d6d20beb8015b5d0 <1ced0a3015a95c6a6db45e37250912c4c86697ab
  15. Affected versionversion=c3e17e58f571f34c51aeb17274ed02c2ed5cf780 <7cf6466e00a77b0a914b7b2c28a1fc7947d55e59
  16. Affected versionversion=d39bf40e55e666b5905fdbd46a0dced030ce87be <aefcc25f3a0cd28a87d11d41d30419a12cd26a34
  17. Affected versionversion=d39bf40e55e666b5905fdbd46a0dced030ce87be <bee90911e0138c76ee67458ac0d58b38a3190f65

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0d4395477741608d123dad51def9fe50b7ebe952; version=0f8cdfff06829a0b0348b6debc29ff6a61967724 <79dcbd8176152b860028b62f81a635d987365752; version=3f57c3f67fd93b4da86aeffea1ca32c484d054ad <76b648063eb36c72dfc0a6896de8a0a7d2c7841c; version=4.14.255 <4.14.260; version=4.19.216 <4.19.223; version=4.4.292 <4.4.297; version=4.9.290 <4.9.295; version=5.10.77 <5.10.89; version=5.14.16 <5.15; version=5.15; version=5.4.157 <5.4.169; version=60833707b968d5ae02a75edb7886dcd4a957cf0d <d53456492b5d02033c73dfa0f3b94c86337791ba; version=73d2892148aa4397a885b4f4afcfc5b27a325c42 <0aaec9c5f60754b56f84460ea439b8c5e91f4caa; version=bda41654b6e0c125a624ca35d6d20beb8015b5d0 <1ced0a3015a95c6a6db45e37250912c4c86697ab; version=c3e17e58f571f34c51aeb17274ed02c2ed5cf780 <7cf6466e00a77b0a914b7b2c28a1fc7947d55e59; version=d39bf40e55e666b5905fdbd46a0dced030ce87be <aefcc25f3a0cd28a87d11d41d30419a12cd26a34; version=d39bf40e55e666b5905fdbd46a0dced030ce87be <bee90911e0138c76ee67458ac0d58b38a3190f65

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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-401Missing Release of Memory after Effective Lifetime
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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