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NVD / CVE Program· CNA Linux

CVE-2021-47137: net: lantiq: fix memory corruption in RX ring

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.60% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 46dd4abced3cb2c912916f4a5353e0927db0c4a2, 5ac72351655f8b033a2935646f53b7465c903418, 8bb1077448d43a871ed667520763e3b9f9b7975d.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 46dd4abced3cb2c912916f4a5353e0927db0c4a2, 5ac72351655f8b033a2935646f53b7465c903418, 8bb1077448d43a871ed667520763e3b9f9b7975d 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: lantiq: fix memory corruption in RX ring In a situation where memory allocation or dma mapping fails, an invalid address is programmed into the descriptor. This can lead to memory corruption. If the memory allocation fails, DMA should reuse the previous skb and mapping and drop the packet. This patch also increments rx drop counter.

Published
Mar 25, 2024
Updated
Aug 5, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2021-47137

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

    • 4.20affected
    • fe1a56420cf2ec28c8eceef672b87de0bbe1a260 and later · before 8bb1077448d43a871ed667520763e3b9f9b7975daffected · git
    • fe1a56420cf2ec28c8eceef672b87de0bbe1a260 and later · before 5ac72351655f8b033a2935646f53b7465c903418affected · git
    • fe1a56420cf2ec28c8eceef672b87de0bbe1a260 and later · before 46dd4abced3cb2c912916f4a5353e0927db0c4a2affected · git
    • fe1a56420cf2ec28c8eceef672b87de0bbe1a260 and later · before c7718ee96dbc2f9c5fc3b578abdf296dd44b9c20affected · git
    • before 4.20not affected · semver
    • 5.4.124 and later · up to and including 5.4.*not affected · semver
    • 5.10.42 and later · up to and including 5.10.*not affected · semver
    • 5.12.9 and later · up to and including 5.12.*not affected · semver
    • 5.13 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 kernel4.20 and later · before 5.4.124
  • linux linux kernel5.5 and later · before 5.10.42
  • linux linux kernel5.11 and later · before 5.12.9
  • linux linux kernel5.13

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.6-15.14.6-1

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-2024-26643Mar 21, 2024 · netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout
    22Monitor
  • ← EarlierCVE-2021-47136Mar 25, 2024 · net: zero-initialize tc skb extension on allocation
    22Monitor
  • Later →CVE-2021-47138Mar 25, 2024 · cxgb4: avoid accessing registers when clearing filters
    28Monitor

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 Linux46dd4abced3cb2c912916f4a5353e0927db0c4a2Vendor (CNA)
Linux Linux5ac72351655f8b033a2935646f53b7465c903418Vendor (CNA)
Linux Linux8bb1077448d43a871ed667520763e3b9f9b7975dVendor (CNA)
Linux Linuxc7718ee96dbc2f9c5fc3b578abdf296dd44b9c20Vendor (CNA)
debian:linux5.14.6-1 · Debian:12Package 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.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-3596956 days apartipv6: fix race condition between ipv6_get_ifaddr and ipv6_del_addr
    35Monitor
  • CVE-2021-4755160 days apartdrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
    31Monitor
  • CVE-2024-3402791 days apartf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
    31Monitor
  • CVE-2021-4713010 days apartnvmet: fix freeing unallocated p2pmem
    30Monitor
  • CVE-2023-5252923 days apartHID: sony: Fix a potential memory leak in sony_probe()
    24Monitor
  • CVE-2024-2689423 days apartACPI: processor_idle: Fix memory leak in acpi_processor_power_exit()
    24Monitor

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 · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

nvd-secondary

Attack context

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

References

Show all references (3 more)

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

All records