CVE-2026-43172

Kernel memory corruption via invalid LMAC count

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds access in Linux Kernel 5.8 through 6.18.15 and 6.19 through 6.19.5 allows remote attackers to corrupt kernel memory. The iwlwifi SMEM parser trusts a firmware-reported count of three LMACs and indexes fwrt->smem_cfg.lmac[2] beyond the two-entry array. Reachability requires the iwlwifi 22000-series path and a firmware response with the impossible count; remote attackers must be on an adjacent network but need no privileges or user interaction.

CVSS severity8.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux Kernel 5.8 through 6.18.15 and 6.19 through 6.19.5 allows remote attackers to corrupt kernel memory. The iwlwifi SMEM parser trusts a firmware-reported count of three LMACs and indexes fwrt->smem_cfg.lmac[2] beyond the two-entry array. Reachability requires the iwlwifi 22000-series path and a firmware response with the impossible count; remote attackers must be on an adjacent network but need no privileges or user interaction.

The record

CVE
CVE-2026-43172
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d49a42717bdc8de77eabeb5b7d3e88d141ffea9
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b4b1510aaaf5b9fb57327ecffc20c055f61f205
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58192b9ce09b0f0f86e2036683bd542130b91a98

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d49a42717bdc8de77eabeb5b7d3e88d141ffea9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b4b1510aaaf5b9fb57327ecffc20c055f61f205; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58192b9ce09b0f0f86e2036683bd542130b91a98

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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