4.6

CVE-2023-53715: wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex

Deferred
AliasesUBUNTU-CVE-2023-53715DEBIAN-CVE-2023-53715
Published 22-10-2025Last modified 11-05-2026

Vulnerability summary

CVE-2023-53715 is a medium (CVSS 4.6) vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.6, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.6/10
010
Medium · v4.0 (OSV · Ubuntu), selected by version preference
EPSS score
0.21%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
SUSE-SU-2025:4111-1SUSE-SU-2025:4139-1SUSE-SU-2025:4149-1SUSE-SU-2025:4189-1SUSE-SU-2025:4320-1

Timeline

  1. 22-10-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex Apparently the hex passphrase mechanism does not work on newer chips/firmware (e.g. BCM4387). It seems there was a simple way of passing it in binary all along, so use that and avoid the hexification. OpenBSD has been doing it like this from the beginning, so this should work on all chips. Also clear the structure before setting the PMK. This was leaking uninitialized stack contents to the device.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.21% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu123 products
  • linuxAll versions (No fix recorded) | < 5.4.0-162.179 | < 5.15.0-83.92
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1109.118 | < 5.15.0-1044.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.37-1 | < 6.3.7-1
Linux1 product
  • linux≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 1687845eb8f37360a9ee849a3587ab659b090773 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 2bc34facb90ceeff6f8c17d2006575a6d07c3825 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 56c7e9c39bd54fd753c0c4b1ed10278cbd3a5f02 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 4e8dc0e5c7636efaadbd7e488acd34b4291c0431 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < e242c66f7ecfe8f5b6eb308f4ea464fd8589c866 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < f8a6c53ff1d91acd5a20eb627edbffd816eb9a4e | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 2fa3a5226b05e0a797c68b9609dcebe0cd236b27 | ≥ b8a64f0e96c2b258321ee03975aeb0f5e88a055b, < 89b89e52153fda2733562776c7c9d9d3ebf8dd6d | 4.13

3 vendors · 125 products

References

12 links
Show all 12 references