CVE-2026-43386

Kernel-memory disclosure via premature WMM IE access

Published May 8, 2026 · Updated May 8, 2026

An out-of-bounds read in the Linux Kernel rtl8723bs driver allows local users to disclose kernel memory through a crafted WMM IE. The rtw_restruct_wmm_ie function reads the sixth byte of a WMM element before confirming that the input length covers that byte, so a truncated element is accessed past its buffer. Exploitation requires local low-privileged access and the rtl8723bs driver; the read can disclose kernel data or interrupt the system.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the Linux Kernel rtl8723bs driver allows local users to disclose kernel memory through a crafted WMM IE. The rtw_restruct_wmm_ie function reads the sixth byte of a WMM element before confirming that the input length covers that byte, so a truncated element is accessed past its buffer. Exploitation requires local low-privileged access and the rtl8723bs driver; the read can disclose kernel data or interrupt the system.

The record

CVE
CVE-2026-43386
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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 <12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020
  3. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <209644e25757c499e1c1f08c071ea0386d4448b6
  4. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b
  5. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259
  6. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <768f25613a9fe6766d15a4a72979657adfc1c6d8
  7. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <a75281626fc8fa6dc6c9cc314ee423e8bc45203b
  8. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <d97fc1b29513010b60fde874c7f0ba816744e18c
  9. Affected versionversion=554c0a3abf216c991c5ebddcdb2c08689ecd290b <e14a1148f02e8cf1ca380d57e4b95ca36c97f45d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <209644e25757c499e1c1f08c071ea0386d4448b6; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <768f25613a9fe6766d15a4a72979657adfc1c6d8; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <a75281626fc8fa6dc6c9cc314ee423e8bc45203b; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <d97fc1b29513010b60fde874c7f0ba816744e18c; version=554c0a3abf216c991c5ebddcdb2c08689ecd290b <e14a1148f02e8cf1ca380d57e4b95ca36c97f45d

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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