NVD / CVE Program· CNA Linux

CVE-2021-47172: iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers

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 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc, 5.4.124, f2a772c51206b0c3f262e4f6a3812c89a650191b.

Low priority for now. Upgrade to Linux Linux 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc, 5.4.124, f2a772c51206b0c3f262e4f6a3812c89a650191b 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: iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers Channel numbering must start at 0 and then not have any holes, or it is possible to overflow the available storage. Note this bug was introduced as part of a fix to ensure we didn't rely on the ordering of child nodes. So we need to support arbitrary ordering but they all need to be there somewhere. Note I hit this when using qemu to test the rest of this series. Arguably this isn't the best fix, but it is probably the most minimal option for backporting etc. Alexandru's sign-off is here because he carried this patch in a larger set that Jonathan then applied.

MediumCVSS 5.5 · v3.1—No exploit Fix available

BDU:2025-07365

Published: Mar 25, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 13th percentile
CWE: CWE-120

Report tools

JSON

Action score

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

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel5.4.14 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

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
- 5.5affected
- 5408cbc6337300d6f1a87c797273c535ed96305a and later · before f49149964d2423fb618fb6b755bb1eaa431cca2caffected · git
- d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and later · before f70122825076117787b91e7f219e21c09f11a5b9affected · git
- d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and later · before 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdcaffected · git
- d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and later · before f2a772c51206b0c3f262e4f6a3812c89a650191baffected · git
- 5.4.14 and later · before 5.4.124affected · semver
- before 5.5not 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

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.14.6-1	5.14.6-1

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-2021-47170Mar 25, 2024 · USB: usbfs: Don't WARN about excessively large memory allocations
22Monitor
← EarlierCVE-2021-47171Mar 25, 2024 · net: usb: fix memory leak in smsc75xx_bind
22Monitor
Later →CVE-2021-47173Mar 25, 2024 · misc/uss720: fix memory leak in uss720_probe
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 / package	Fixed version	Source
Linux Linux	26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc	Vendor (CNA)
Linux Linux	5.4.124	Vendor (CNA)
Linux Linux	f2a772c51206b0c3f262e4f6a3812c89a650191b	Vendor (CNA)
Linux Linux	f49149964d2423fb618fb6b755bb1eaa431cca2c	Vendor (CNA)
Linux Linux	f70122825076117787b91e7f219e21c09f11a5b9	Vendor (CNA)
debian:linux	5.14.6-1 · Debian:12	Package 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.

No history yet (it accumulates with the daily EPSS job).

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.

CVE-2023-44466178 days apartAn issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5.
48Plan
CVE-2023-5273557 days apartbpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself
36Monitor
CVE-2024-2692734 days apartASoC: SOF: Add some bounds checking to firmware data
33Monitor
CVE-2023-526127 days apartcrypto: scomp - fix req->dst buffer overflow
31Monitor
CVE-2023-526147 days apartPM / devfreq: Fix buffer overflow in trans_stat_show
31Monitor
CVE-2024-2679710 days apartdrm/amd/display: Prevent potential buffer overflow in map_hw_resources
31Monitor

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).

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-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

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

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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

References

git.kernel.org/stable/c/26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc

Show all references (3 more)

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

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