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NVD / CVE Program· CNA Linux

CVE-2021-47029: mt76: connac: fix kernel warning adding monitor interface

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.24% (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 2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7, c996f0346e40e3b1ac2ebaf0681df898fb157f60.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7, c996f0346e40e3b1ac2ebaf0681df898fb157f60 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: connac: fix kernel warning adding monitor interface Fix the following kernel warning adding a monitor interface in mt76_connac_mcu_uni_add_dev routine. [ 507.984882] ------------[ cut here ]------------ [ 507.989515] WARNING: CPU: 1 PID: 3017 at mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.059379] CPU: 1 PID: 3017 Comm: ifconfig Not tainted 5.4.98 #0 [ 508.065461] Hardware name: MT7622_MT7531 RFB (DT) [ 508.070156] pstate: 80000005 (Nzcv daif -PAN -UAO) [ 508.074939] pc : mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.081806] lr : mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.087367] sp : ffffffc013a33930 [ 508.090671] x29: ffffffc013a33930 x28: ffffff801e628ac0 [ 508.095973] x27: ffffff801c7f1200 x26: ffffff801c7eb008 [ 508.101275] x25: ffffff801c7eaef0 x24: ffffff801d025610 [ 508.106577] x23: ffffff801d022990 x22: ffffff801d024de8 [ 508.111879] x21: ffffff801d0226a0 x20: ffffff801c7eaee8 [ 508.117181] x19: ffffff801d0226a0 x18: 000000005d00b000 [ 508.122482] x17: 00000000ffffffff x16: 0000000000000000 [ 508.127785] x15: 0000000000000080 x14: ffffff801d704000 [ 508.133087] x13: 0000000000000040 x12: 0000000000000002 [ 508.138389] x11: 000000000000000c x10: 0000000000000000 [ 508.143691] x9 : 0000000000000020 x8 : 0000000000000001 [ 508.148992] x7 : 0000000000000000 x6 : 0000000000000000 [ 508.154294] x5 : ffffff801c7eaee8 x4 : 0000000000000006 [ 508.159596] x3 : 0000000000000001 x2 : 0000000000000000 [ 508.164898] x1 : ffffff801c7eac08 x0 : ffffff801d0226a0 [ 508.170200] Call trace: [ 508.172640] mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.179159] mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.184394] drv_add_interface+0x34/0x88 [mac80211] [ 508.189271] ieee80211_add_virtual_monitor+0xe0/0xb48 [mac80211] [ 508.195277] ieee80211_do_open+0x86c/0x918 [mac80211] [ 508.200328] ieee80211_do_open+0x900/0x918 [mac80211] [ 508.205372] __dev_open+0xcc/0x150 [ 508.208763] __dev_change_flags+0x134/0x198 [ 508.212937] dev_change_flags+0x20/0x60 [ 508.216764] devinet_ioctl+0x3e8/0x748 [ 508.220503] inet_ioctl+0x1e4/0x350 [ 508.223983] sock_do_ioctl+0x48/0x2a0 [ 508.227635] sock_ioctl+0x310/0x4f8 [ 508.231116] do_vfs_ioctl+0xa4/0xac0 [ 508.234681] ksys_ioctl+0x44/0x90 [ 508.237985] __arm64_sys_ioctl+0x1c/0x48 [ 508.241901] el0_svc_common.constprop.1+0x7c/0x100 [ 508.246681] el0_svc_handler+0x18/0x20 [ 508.250421] el0_svc+0x8/0x1c8 [ 508.253465] ---[ end trace c7b90fee13d72c39 ]--- [ 508.261278] ------------[ cut here ]------------

Published
Feb 28, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 15th percentile
CWE
—

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

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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

    • 5.12affected
    • d0e274af2f2e44b9d496f5d2c0431fdd2ea76fb8 and later · before 2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7affected · git
    • d0e274af2f2e44b9d496f5d2c0431fdd2ea76fb8 and later · before c996f0346e40e3b1ac2ebaf0681df898fb157f60affected · git
    • before 5.12not affected · semver
    • 5.12.4 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 5.12.4

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-2021-47027Feb 28, 2024 · mt76: mt7921: fix kernel crash when the firmware fails to download
    22Monitor
  • ← EarlierCVE-2021-47028Feb 28, 2024 · mt76: mt7915: fix txrate reporting
    31Monitor
  • Later →CVE-2021-47030Feb 28, 2024 · mt76: mt7615: fix memory leak in mt7615_coredump_work
    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 Linux2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7Vendor (CNA)
Linux Linuxc996f0346e40e3b1ac2ebaf0681df898fb157f60Vendor (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.

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 · variant or chain candidate · public bounty program.

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)

—

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.

References

Show all references (1 more)

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

All records