CVE-2023-53715

Kernel stack disclosure via uncleared PMK structure

Published Oct 22, 2025 · Updated Oct 22, 2025

Information disclosure in Linux brcmfmac allows adjacent attackers to obtain uninitialized kernel stack contents through PMK setup. The brcmf_set_pmk function sends the full brcmf_wsec_pmk_le structure to device firmware without first clearing bytes left unwritten by PMK encoding. Exposure requires the brcmfmac driver and compatible Broadcom wireless hardware; the published impact is limited to confidentiality.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux brcmfmac allows adjacent attackers to obtain uninitialized kernel stack contents through PMK setup. The brcmf_set_pmk function sends the full brcmf_wsec_pmk_le structure to device firmware without first clearing bytes left unwritten by PMK encoding. Exposure requires the brcmfmac driver and compatible Broadcom wireless hardware; the published impact is limited to confidentiality.

The record

CVE
CVE-2023-53715
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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 <1687845eb8f37360a9ee849a3587ab659b090773
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bc34facb90ceeff6f8c17d2006575a6d07c3825
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fa3a5226b05e0a797c68b9609dcebe0cd236b27
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4e8dc0e5c7636efaadbd7e488acd34b4291c0431
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56c7e9c39bd54fd753c0c4b1ed10278cbd3a5f02
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89b89e52153fda2733562776c7c9d9d3ebf8dd6d
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e242c66f7ecfe8f5b6eb308f4ea464fd8589c866
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8a6c53ff1d91acd5a20eb627edbffd816eb9a4e

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1687845eb8f37360a9ee849a3587ab659b090773; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bc34facb90ceeff6f8c17d2006575a6d07c3825; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fa3a5226b05e0a797c68b9609dcebe0cd236b27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4e8dc0e5c7636efaadbd7e488acd34b4291c0431; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56c7e9c39bd54fd753c0c4b1ed10278cbd3a5f02; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89b89e52153fda2733562776c7c9d9d3ebf8dd6d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e242c66f7ecfe8f5b6eb308f4ea464fd8589c866; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8a6c53ff1d91acd5a20eb627edbffd816eb9a4e

Published CVSS scores

7.1SUSECVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5SUSECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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

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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