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NVD / CVE Program· CNA Linux

CVE-2021-47442: NFC: digital: fix possible memory leak in digital_in_send_sdd_req()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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 071bdef36391958c89af5fa2172f691b31baa212, 291c932fc3692e4d211a445ba8aa35663831bac7, 2bde4aca56db9fe25405d39ddb062531493a65db.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 071bdef36391958c89af5fa2172f691b31baa212, 291c932fc3692e4d211a445ba8aa35663831bac7, 2bde4aca56db9fe25405d39ddb062531493a65db 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: NFC: digital: fix possible memory leak in digital_in_send_sdd_req() 'skb' is allocated in digital_in_send_sdd_req(), but not free when digital_in_send_cmd() failed, which will cause memory leak. Fix it by freeing 'skb' if digital_in_send_cmd() return failed.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 22, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

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-2021-47442

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

Affected versions

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

  • linux linux kernel3.13 and later · before 4.4.290
  • linux linux kernel4.5 and later · before 4.9.288
  • linux linux kernel4.10 and later · before 4.14.252
  • linux linux kernel4.15 and later · before 4.19.213
  • linux linux kernel4.20 and later · before 5.4.155
  • linux linux kernel5.5 and later · before 5.10.75
  • linux linux kernel5.11 and later · before 5.14.14
  • linux linux kernel5.15

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

    • 3.13affected
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 74569c78aa84f8c958f1334b465bc530906ec99aaffected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 88c890b0b9a1fb9fcd01c61ada515e8b636c34f9affected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before fcce6e5255474ca33c27dda0cdf9bf5087278873affected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 071bdef36391958c89af5fa2172f691b31baa212affected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 2bde4aca56db9fe25405d39ddb062531493a65dbaffected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 50cb95487c265187289810addec5093d4fed8329affected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 6432d7f1d1c3aa74cfe8f5e3afdf81b786c32e86affected · git
    • 2c66daecc4092e6049673c281b2e6f0d5e59a94c and later · before 291c932fc3692e4d211a445ba8aa35663831bac7affected · git
    • before 3.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.16-15.14.16-1

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-2021-47440May 22, 2024 · net: encx24j600: check error in devm_regmap_init_encx24j600
    9Monitor
  • ← EarlierCVE-2021-47441May 22, 2024 · mlxsw: thermal: Fix out-of-bounds memory accesses
    29Monitor
  • Later →CVE-2021-47443May 22, 2024 · NFC: digital: fix possible memory leak in digital_tg_listen_mdaa()
    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 Linux071bdef36391958c89af5fa2172f691b31baa212Vendor (CNA)
Linux Linux291c932fc3692e4d211a445ba8aa35663831bac7Vendor (CNA)
Linux Linux2bde4aca56db9fe25405d39ddb062531493a65dbVendor (CNA)
Linux Linux50cb95487c265187289810addec5093d4fed8329Vendor (CNA)
Linux Linux6432d7f1d1c3aa74cfe8f5e3afdf81b786c32e86Vendor (CNA)
Linux Linux74569c78aa84f8c958f1334b465bc530906ec99aVendor (CNA)
Linux Linux88c890b0b9a1fb9fcd01c61ada515e8b636c34f9Vendor (CNA)
Linux Linuxfcce6e5255474ca33c27dda0cdf9bf5087278873Vendor (CNA)
debian:linux5.14.16-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

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

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

nvd-primary

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records