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NVD / CVE Program· CNA Linux

CVE-2021-47204: net: dpaa2-eth: fix use-after-free in dpaa2_eth_remove

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9, 32d4686224744819ddcae58b666c21d2a4ef4c88, 9b5a333272a48c2f8b30add7a874e46e8b26129c.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9, 32d4686224744819ddcae58b666c21d2a4ef4c88, 9b5a333272a48c2f8b30add7a874e46e8b26129c or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: net: dpaa2-eth: fix use-after-free in dpaa2_eth_remove Access to netdev after free_netdev() will cause use-after-free bug. Move debug log before free_netdev() call to avoid it.

Published
Apr 10, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-47204

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.17affected
    • 7472dd9f649958be6a8880ed439233c8414a7b34 and later · before d74ff10ed2d93dc9b67e99a74b36fb9a83273d8aaffected · git
    • 7472dd9f649958be6a8880ed439233c8414a7b34 and later · before 1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9affected · git
    • 7472dd9f649958be6a8880ed439233c8414a7b34 and later · before 32d4686224744819ddcae58b666c21d2a4ef4c88affected · git
    • 7472dd9f649958be6a8880ed439233c8414a7b34 and later · before 9b5a333272a48c2f8b30add7a874e46e8b26129caffected · git
    • before 4.17not affected · semver
    • 5.4.162 and later · up to and including 5.4.*not affected · semver
    • 5.10.82 and later · up to and including 5.10.*not affected · semver
    • 5.15.5 and later · up to and including 5.15.*not affected · semver
    • 5.16 and laternot affected · original_commit_for_fix
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.17 and later · before 5.4.162
  • linux linux kernel5.5 and later · before 5.10.82
  • linux linux kernel5.11 and later · before 5.15.5
  • linux linux kernel5.16

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.15.5-15.15.5-1
openSUSE:Leap 15.5kernel-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1
openSUSE:Leap 15.5kernel-source-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1
openSUSE:Leap 15.5kernel-syms-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP5kernel-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP5kernel-source-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP5kernel-syms-azurebefore 5.14.21-150500.33.51.15.14.21-150500.33.51.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-47202Apr 10, 2024 · thermal: Fix NULL pointer dereferences in of_thermal_ functions
    22Monitor
  • ← EarlierCVE-2021-47203Apr 10, 2024 · scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()
    22Monitor
  • Later →CVE-2021-47205Apr 10, 2024 · clk: sunxi-ng: Unregister clocks/resets when unbinding
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9Vendor (CNA)
Linux Linux32d4686224744819ddcae58b666c21d2a4ef4c88Vendor (CNA)
Linux Linux9b5a333272a48c2f8b30add7a874e46e8b26129cVendor (CNA)
Linux Linuxd74ff10ed2d93dc9b67e99a74b36fb9a83273d8aVendor (CNA)
debian:linux5.15.5-1 · Debian:12Package registry (OSV)
opensuse:kernel-azure5.14.21-150500.33.51.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150500.33.51.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150500.33.51.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:kernel-azure5.14.21-150500.33.51.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-source-azure5.14.21-150500.33.51.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-syms-azure5.14.21-150500.33.51.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records