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Review reviewHigh

CVE-2025-39864

Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix use-after-free in cmp_bss() Following bss_free() quirk introduced in commit 776b3580178f ("cfg80211: track hidden SSID networks properly"), adjust cfg80211_update_known_bss() to free the last beacon frame elements only if they're not shared via the corresponding 'hidden_beacon_bss' pointer.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.09.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix use-after-free in cmp_bss() Following bss_free() quirk introduced in commit 776b3580178f ("cfg80211: track hidden SSID networks properly"), adjust cfg80211_update_known_bss() to free the last beacon frame elements only if they're not shared via the corresponding 'hidden_beacon_bss' pointer.

Affected product and versions

Product
Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Affected versions
>= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < a8bb681e879ca3c9f722aa08d3d7ae41c42a8807, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < a97a9791e455bb0cd5e7a38b5abcb05523d4e21c, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < ff040562c10a540b8d851f7f4145fa112977f853, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < 6854476d9e1aeaaf05ebc98d610061c2075db07d, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < b7d08929178c16398278613df07ad65cf63cce9d, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < 5b7ae04969f822283a95c866967e42b4d75e0eef, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < 912c4b66bef713a20775cfbf3b5e9bd71525c716, >= 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 < 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08, >= 5.4, < V3.3, < V5.0, >= 5.4 < 5.4.299, >= 5.5 < 5.10.243, >= 5.11 < 5.15.192, >= 5.16 < 6.1.151, >= 6.2 < 6.6.105, >= 6.7 < 6.12.46, >= 6.13 < 6.16.6, 6.17, 11.0
Fixed versions
5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416