5.3

CVE-2021-47064: mt76: fix potential DMA mapping leak

Analyzed
AliasesUBUNTU-CVE-2021-47064DEBIAN-CVE-2021-47064
Published 29-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47064 is a medium (CVSS 5.3) vulnerability in linux. EPSS estimates a 0.77% chance of exploitation in the next 30 days, higher than 55.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.77%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 29-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: mt76: fix potential DMA mapping leak With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap could potentially inherit a non-zero value from stack garbage. If this happens, it will cause DMA mappings for MCU command frames to not be unmapped after completion

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.77%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.77% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu62 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, < 9fa26701cd1fc4d932d431971efc5746325bdfce | ≥ 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, < 9b68ce2856dadc0e1cb6fd21fbeb850da49efd08 | ≥ 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, < 91b9548d413fda488ea853cd1b9f59b572db3a0c | ≥ 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, < b4403cee6400c5f679e9c4a82b91d61aa961eccf | 5.10
  • linux_kernel≥ 5.10, < 5.10.37 | ≥ 5.11, < 5.11.21 | ≥ 5.12, < 5.12.4
Debian1 product
  • linux< 5.10.38-1

3 vendors · 65 products

References

8 links