CVE-2026-74341

Kernel code execution via oversized HAL response

Published Aug 15, 2026 · Updated Aug 15, 2026

Heap buffer overflow in the Linux wcn36xx Wi-Fi driver allows attackers to execute code or crash the kernel via an oversized HAL response. The wcn36xx_smd_rsp_process dispatcher copies a synchronous HAL response into the fixed 4096-byte hal_buf without first rejecting lengths above WCN36XX_HAL_BUF_SIZE. Exploitation requires a crafted response from the WCN36xx firmware path; successful corruption crashes the kernel or executes code in kernel context.

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

Heap buffer overflow in the Linux wcn36xx Wi-Fi driver allows attackers to execute code or crash the kernel via an oversized HAL response. The wcn36xx_smd_rsp_process dispatcher copies a synchronous HAL response into the fixed 4096-byte hal_buf without first rejecting lengths above WCN36XX_HAL_BUF_SIZE. Exploitation requires a crafted response from the WCN36xx firmware path; successful corruption crashes the kernel or executes code in kernel context.

The record

CVE
CVE-2026-74341
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=3.13
  2. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <15545ee71301e82d26d9a31b407ed0019eb62a60
  3. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <18813b90032bfaafb225906a4d2b51be4dfc02c3
  4. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <1b5d8a248c3afa640bcc99fa95abcd1e36f3ee18
  5. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <88a240d86d3d64521f9194abe185ac71cc74d0bd
  6. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <cfc67aee0c83e7f5d43a1dad3e25c789e9cc1d92
  7. Affected versionversion=8e84c25821698bdef73c0329fb2022a4673b7adc <dae9cadf0925f1cbfb71306d60490890df3870a6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=8e84c25821698bdef73c0329fb2022a4673b7adc <15545ee71301e82d26d9a31b407ed0019eb62a60; version=8e84c25821698bdef73c0329fb2022a4673b7adc <18813b90032bfaafb225906a4d2b51be4dfc02c3; version=8e84c25821698bdef73c0329fb2022a4673b7adc <1b5d8a248c3afa640bcc99fa95abcd1e36f3ee18; version=8e84c25821698bdef73c0329fb2022a4673b7adc <88a240d86d3d64521f9194abe185ac71cc74d0bd; version=8e84c25821698bdef73c0329fb2022a4673b7adc <cfc67aee0c83e7f5d43a1dad3e25c789e9cc1d92; version=8e84c25821698bdef73c0329fb2022a4673b7adc <dae9cadf0925f1cbfb71306d60490890df3870a6

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.8cve.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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