CVE-2026-74649

Kernel memory corruption via oversized WEP challenge

Published Aug 22, 2026 · Updated Aug 25, 2026

Buffer overflow in Linux rtl8723bs allows physically proximate attackers to corrupt kernel memory via a malformed WEP challenge. OnAuthClient() copies the attacker-controlled rtw_get_ie() length, up to 255 bytes, into the fixed 128-byte chg_txt buffer without validating the required length. The path is reachable over the air before association during WEP shared-key authentication; oversized input writes out of bounds, while short input echoes stale buffer contents.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Linux rtl8723bs allows physically proximate attackers to corrupt kernel memory via a malformed WEP challenge. OnAuthClient() copies the attacker-controlled rtw_get_ie() length, up to 255 bytes, into the fixed 128-byte chg_txt buffer without validating the required length. The path is reachable over the air before association during WEP shared-key authentication; oversized input writes out of bounds, while short input echoes stale buffer contents.

The record

CVE
CVE-2026-74649
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120, T1557.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=4.12
  2. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <2c56ef658ac8c6bca36bc5574715e8f717207c6c
  3. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <39ae1033071001af9bb4573ebdbb43bbbe88f749
  4. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4ba402fd47009d20e51dbfc934abb562098ea35b
  5. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722
  6. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <6235b5156b48ed5d1ce3410d8f0b2fd67d30d944
  7. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <87c2f073d2aaea041d531b8e579c47570b54b3b7
  8. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <a28a4b0592e4a37ea471bc0d308513a93133ce7e

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <2c56ef658ac8c6bca36bc5574715e8f717207c6c; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <39ae1033071001af9bb4573ebdbb43bbbe88f749; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4ba402fd47009d20e51dbfc934abb562098ea35b; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <6235b5156b48ed5d1ce3410d8f0b2fd67d30d944; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <87c2f073d2aaea041d531b8e579c47570b54b3b7; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <a28a4b0592e4a37ea471bc0d308513a93133ce7e

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.6Amazon LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
8.8Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5OracleCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1557.004Evil Twin

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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