CVE-2021-47549

Kernel crash via stale sata_fsl teardown read

Published May 24, 2024 · Updated May 11, 2026

Use-after-free in the Linux kernel sata_fsl driver allows local users to crash PPC64 systems by unloading its kernel module. sata_fsl_remove unmaps hcr_base and frees host_priv before ata_host_stop invokes sata_fsl_port_stop, which calls ioread32 through the stale mapping. Triggering the fault requires local privilege to remove sata_fsl.ko on a PPC64 system using the Freescale SATA driver; the demonstrated consequence is a kernel oops and service interruption.

CVSS severity7.8
High
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

Use-after-free in the Linux kernel sata_fsl driver allows local users to crash PPC64 systems by unloading its kernel module. sata_fsl_remove unmaps hcr_base and frees host_priv before ata_host_stop invokes sata_fsl_port_stop, which calls ioread32 through the stale mapping. Triggering the fault requires local privilege to remove sata_fsl.ko on a PPC64 system using the Freescale SATA driver; the demonstrated consequence is a kernel oops and service interruption.

The record

CVE
CVE-2021-47549
Published
May 24, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 24, 2024CVE 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

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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=2.6.24
  2. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <0769449b0a5eabc3545337217ae690e46673e73a
  3. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1
  4. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <4a46b2f5dce02539e88a300800812bd24a45e097
  5. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <6c8ad7e8cf29eb55836e7a0215f967746ab2b504
  6. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <77393806c76b6b44f1c44bd957788c8bd9152c45
  7. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <91ba94d3f7afca195b224f77a72044fbde1389ce
  8. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <adf098e2a8a1e1fc075d6a5ba2edd13cf7189082
  9. Affected versionversion=faf0b2e5afe7dae072d2715763c7f992b612b628 <cdcd80292106df5cda325426e96495503e41f947

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.24; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <0769449b0a5eabc3545337217ae690e46673e73a; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <4a46b2f5dce02539e88a300800812bd24a45e097; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <6c8ad7e8cf29eb55836e7a0215f967746ab2b504; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <77393806c76b6b44f1c44bd957788c8bd9152c45; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <91ba94d3f7afca195b224f77a72044fbde1389ce; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <adf098e2a8a1e1fc075d6a5ba2edd13cf7189082; version=faf0b2e5afe7dae072d2715763c7f992b612b628 <cdcd80292106df5cda325426e96495503e41f947

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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