Linux Kernel up to 6.17-rc4 wifi cmp_bss use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.17-rc4. Affected is the function cmp_bss of the component wifi. The manipulation leads to use after free. This vulnerability is traded as CVE-2025-39864. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.17-rc4 and classified as critical. This issue affects the function cmp_bss of the component wifi. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2025-39864 since 04/16/2025. The exploitation is known to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/20/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265469 (Linux Distros Unpatched Vulnerability : CVE-2025-39864), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6 or 6.17-rc5 eliminates this vulnerability. Applying the patch a8bb681e879ca3c9f722aa08d3d7ae41c42a8807/a97a9791e455bb0cd5e7a38b5abcb05523d4e21c/ff040562c10a540b8d851f7f4145fa112977f853/6854476d9e1aeaaf05ebc98d610061c2075db07d/b7d08929178c16398278613df07ad65cf63cce9d/5b7ae04969f822283a95c866967e42b4d75e0eef/912c4b66bef713a20775cfbf3b5e9bd71525c716/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265469) and CERT Bund (WID-SEC-2025-2099). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265469
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39864

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.299/5.10.243/5.15.192/6.1.151/6.6.105/6.12.46/6.16.6/6.17-rc5
Patch: a8bb681e879ca3c9f722aa08d3d7ae41c42a8807/a97a9791e455bb0cd5e7a38b5abcb05523d4e21c/ff040562c10a540b8d851f7f4145fa112977f853/6854476d9e1aeaaf05ebc98d610061c2075db07d/b7d08929178c16398278613df07ad65cf63cce9d/5b7ae04969f822283a95c866967e42b4d75e0eef/912c4b66bef713a20775cfbf3b5e9bd71525c716/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08

Timelineinfo

04/16/2025 CVE reserved
09/19/2025 +156 days Advisory disclosed
09/19/2025 +0 days VulDB entry created
01/20/2026 +123 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39864 (🔒)
GCVE (CVE): GCVE-0-2025-39864
GCVE (VulDB): GCVE-100-325049
CERT Bund: WID-SEC-2025-2099 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/19/2025 18:20
Updated: 01/20/2026 22:33
Changes: 09/19/2025 18:20 (59), 09/23/2025 01:24 (2), 10/20/2025 23:52 (7), 11/12/2025 06:18 (1), 11/29/2025 07:20 (1), 12/22/2025 13:12 (1), 01/20/2026 22:33 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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