CVE-2025-39864: debian linux Use-After-Free — Fix

Description

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.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.4 — 5.4.299
linux	linux_kernel	5.5 — 5.10.243
linux	linux_kernel	5.11 — 5.15.192
linux	linux_kernel	5.16 — 6.1.151
linux	linux_kernel	6.2 — 6.6.105
linux	linux_kernel	6.7 — 6.12.46
linux	linux_kernel	6.13 — 6.16.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08 https://git.kernel.org/stable/c/5b7ae04969f822283a95c866967e42b4d75e0eef https://git.kernel.org/stable/c/6854476d9e1aeaaf05ebc98d610061c2075db07d https://git.kernel.org/stable/c/912c4b66bef713a20775cfbf3b5e9bd71525c716 https://git.kernel.org/stable/c/a8bb681e879ca3c9f722aa08d3d7ae41c42a8807 https://git.kernel.org/stable/c/a97a9791e455bb0cd5e7a38b5abcb05523d4e21c https://git.kernel.org/stable/c/b7d08929178c16398278613df07ad65cf63cce9d https://git.kernel.org/stable/c/ff040562c10a540b8d851f7f4145fa112977f853

Other References

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html https://cert-portal.siemens.com/productcert/html/ssa-032379.html https://cert-portal.siemens.com/productcert/html/ssa-089022.html

Frequently Asked Questions

What is CVE-2025-39864? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39864? +

CVE-2025-39864 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-39864? +

CVE-2025-39864 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-39864? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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