CVE-2021-47614

Local privilege escalation via dangling PBLE chunk

Published Jun 19, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel irdma driver 5.14 through 5.15.9 allows local users to corrupt kernel memory through RDMA verbs. When irdma_hmc_sd_one fails, add_pble_prm frees a PBLE chunk that remains linked in pinfo.clist, so later allocation or cleanup walks reclaimed memory. Access to an irdma-backed /dev/infiniband/uverbs device is required; unprivileged memory-registration requests can expose kernel data, overwrite kernel memory, or panic the host.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel irdma driver 5.14 through 5.15.9 allows local users to corrupt kernel memory through RDMA verbs. When irdma_hmc_sd_one fails, add_pble_prm frees a PBLE chunk that remains linked in pinfo.clist, so later allocation or cleanup walks reclaimed memory. Access to an irdma-backed /dev/infiniband/uverbs device is required; unprivileged memory-registration requests can expose kernel data, overwrite kernel memory, or panic the host.

The record

CVE
CVE-2021-47614
Published
Jun 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.14
  2. Affected versionversion=e8c4dbc2fcacf5a7468d312168bb120c27c38b32 <11eebcf63e98fcf047a876a51d76afdabc3b8b9b
  3. Affected versionversion=e8c4dbc2fcacf5a7468d312168bb120c27c38b32 <1e11a39a82e95ce86f849f40dda0d9c0498cebd9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=e8c4dbc2fcacf5a7468d312168bb120c27c38b32 <11eebcf63e98fcf047a876a51d76afdabc3b8b9b; version=e8c4dbc2fcacf5a7468d312168bb120c27c38b32 <1e11a39a82e95ce86f849f40dda0d9c0498cebd9

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-416Use After Free
T1068Exploitation for Privilege Escalation

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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