CVE-2023-53213

Kernel heap disclosure via unchecked association lengths

Published Sep 15, 2025 · Updated Sep 15, 2025

Out-of-bounds read in Linux brcmfmac before fixed stable releases allows physically proximate attackers to disclose kernel heap data. brcmf_get_assoc_ies passes unchecked req_len or resp_len values to kmemdup, copying beyond the WL_EXTRA_BUF_MAX-sized association buffer into netlink output. A malicious access point or compromised USB Wi-Fi device must supply the oversized length; the read can also trigger a kernel crash.

CVSS severity8.1
High
EPSS probability0.24%
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 read in Linux brcmfmac before fixed stable releases allows physically proximate attackers to disclose kernel heap data. brcmf_get_assoc_ies passes unchecked req_len or resp_len values to kmemdup, copying beyond the WL_EXTRA_BUF_MAX-sized association buffer into netlink output. A malicious access point or compromised USB Wi-Fi device must supply the oversized length; the read can also trigger a kernel crash.

The record

CVE
CVE-2023-53213
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record 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 <0da40e018fd034d87c9460123fa7f897b69fdee7
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <21bee3e649d87f78fe8aef6ae02edd3d6f310fd0
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <228186629ea970cc78b7d7d5f593f2d32fddf9f6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39f9bd880abac6068bedb24a4e16e7bd26bf92da
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <425eea395f1f5ae349fb55f7fe51d833a5324bfe
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <549825602e3e6449927ca1ea1a08fd89868439df
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <936a23293bbb3332bdf4cdb9c1496e80cb0bc2c8
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ac5305e5d227b9af3aae25fa83380d3ff0225b73
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e29661611e6e71027159a3140e818ef3b99f32dd

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0da40e018fd034d87c9460123fa7f897b69fdee7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <21bee3e649d87f78fe8aef6ae02edd3d6f310fd0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <228186629ea970cc78b7d7d5f593f2d32fddf9f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39f9bd880abac6068bedb24a4e16e7bd26bf92da; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <425eea395f1f5ae349fb55f7fe51d833a5324bfe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <549825602e3e6449927ca1ea1a08fd89868439df; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <936a23293bbb3332bdf4cdb9c1496e80cb0bc2c8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ac5305e5d227b9af3aae25fa83380d3ff0225b73; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e29661611e6e71027159a3140e818ef3b99f32dd

Published CVSS scores

8.1LinuxCVSS:3.1/AV:A/AC:L/PR:N/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.

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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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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