CVE-2021-47017

Adjacent memory corruption via freed transmit-bundle length

Published Feb 28, 2024 · Updated Aug 5, 2026

Use-after-free in the ath10k driver in affected Linux kernels allows adjacent attackers to corrupt kernel memory over Wi-Fi. The ath10k_htc_send_bundle function frees bundle_skb on a send-failure path and then reads bundle_skb->len instead of the saved skb_len. Reachability requires an ath10k SDIO/HL Wi-Fi device with transmit bundling active; the stale access can crash the kernel or corrupt its memory.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ath10k driver in affected Linux kernels allows adjacent attackers to corrupt kernel memory over Wi-Fi. The ath10k_htc_send_bundle function frees bundle_skb on a send-failure path and then reads bundle_skb->len instead of the saved skb_len. Reachability requires an ath10k SDIO/HL Wi-Fi device with transmit bundling active; the stale access can crash the kernel or corrupt its memory.

The record

CVE
CVE-2021-47017
Published
Feb 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8
  2. Affected versionversion=c8334512f3dd1b94844baca629f9bedca4271593 <3b1ac40c6012140828caa79e592a438a18ebf71b
  3. Affected versionversion=c8334512f3dd1b94844baca629f9bedca4271593 <5e413c0831ff4700d1739db3fa3ae9f859744676
  4. Affected versionversion=c8334512f3dd1b94844baca629f9bedca4271593 <8392df5d7e0b6a7d21440da1fc259f9938f4dec3
  5. Affected versionversion=c8334512f3dd1b94844baca629f9bedca4271593 <8bb054fb336f4250002fff4e0b075221c05c3c65

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=c8334512f3dd1b94844baca629f9bedca4271593 <3b1ac40c6012140828caa79e592a438a18ebf71b; version=c8334512f3dd1b94844baca629f9bedca4271593 <5e413c0831ff4700d1739db3fa3ae9f859744676; version=c8334512f3dd1b94844baca629f9bedca4271593 <8392df5d7e0b6a7d21440da1fc259f9938f4dec3; version=c8334512f3dd1b94844baca629f9bedca4271593 <8bb054fb336f4250002fff4e0b075221c05c3c65

Published CVSS scores

8.8Linux Kernel CVE TeamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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