NVD / CVE Program· CNA Linux

CVE-2021-47135: mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report

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: 0.21% (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 6919e8a24e70b6ba148fe07f44f835bcdd1a8d02, d874e6c06952382897d35bf4094193cd44ae91bd.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 6919e8a24e70b6ba148fe07f44f835bcdd1a8d02, d874e6c06952382897d35bf4094193cd44ae91bd 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: mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report Fix possible array out of bound access in mt7921_mcu_tx_rate_report. Remove unnecessary varibable in mt7921_mcu_tx_rate_report

BDU:2025-03652

Published: Mar 15, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 12th percentile
CWE: CWE-129

Report tools

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Action score

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: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 7.8; agree

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.

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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

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
- 5.12affected
- 1c099ab44727c8e42fe4de4d91b53cec3ef02860 and later · before 6919e8a24e70b6ba148fe07f44f835bcdd1a8d02affected · git
- 1c099ab44727c8e42fe4de4d91b53cec3ef02860 and later · before d874e6c06952382897d35bf4094193cd44ae91bdaffected · git
- before 5.12not affected · semver
- 5.12.10 and later · up to and including 5.12.*not affected · semver
- 5.13 and laternot affected · original_commit_for_fix

Affected versions

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

linux linux kernel5.12 and later · before 5.12.10
linux linux kernel5.13

Same product

linux: all records

Other highest-scoring records for the same primary product.

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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
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CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
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Published before and after this one in the same product

← EarlierCVE-2021-47133Mar 15, 2024 · HID: amd_sfh: Fix memory leak in amd_sfh_work
22Monitor
← EarlierCVE-2021-47134Mar 15, 2024 · efi/fdt: fix panic when no valid fdt found
22Monitor
Later →CVE-2023-52609Mar 18, 2024 · binder: fix race between mmput() and do_exit()
18Monitor

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	6919e8a24e70b6ba148fe07f44f835bcdd1a8d02	Vendor (CNA)
Linux Linux	d874e6c06952382897d35bf4094193cd44ae91bd	Vendor (CNA)

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-2021-4754870 days apartethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()
39Monitor
CVE-2023-2008336 days apartKernel: udmabuf: improper validation of array index leading to local privilege escalation
32Monitor
CVE-2023-525949 days apartwifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus()
31Monitor
CVE-2023-525999 days apartjfs: fix array-index-out-of-bounds in diNewExt
31Monitor
CVE-2023-526019 days apartjfs: fix array-index-out-of-bounds in dbAdjTree
31Monitor
CVE-2023-526039 days apartUBSAN: array-index-out-of-bounds in dtSplitRoot
31Monitor