NVD / CVE Program· CNA Linux

CVE-2025-39864: wifi: cfg80211: fix use-after-free in cmp_bss()

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08, 5b7ae04969f822283a95c866967e42b4d75e0eef, 6854476d9e1aeaaf05ebc98d610061c2075db07d; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-1.

Low priority for now. Upgrade to Linux Linux 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08, 5b7ae04969f822283a95c866967e42b4d75e0eef, 6854476d9e1aeaaf05ebc98d610061c2075db07d; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Sep 19, 2025
Updated: Oct 19, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 8.8; 1.0 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel
debian	debian linux	cpe:2.3:o:debian:debian_linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

debian debian linux11.0
linux linux kernel5.5 and later · before 5.10.243
linux linux kernel5.11 and later · before 5.15.192
linux linux kernel5.16 and later · before 6.1.151
linux linux kernel5.4 and later · before 5.4.299
linux linux kernel6.7 and later · before 6.12.46
linux linux kernel6.13 and later · before 6.16.6
linux linux kernel6.2 and later · before 6.6.105
linux linux kernel6.17

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.4affected
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before a8bb681e879ca3c9f722aa08d3d7ae41c42a8807affected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before a97a9791e455bb0cd5e7a38b5abcb05523d4e21caffected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before ff040562c10a540b8d851f7f4145fa112977f853affected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before 6854476d9e1aeaaf05ebc98d610061c2075db07daffected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before b7d08929178c16398278613df07ad65cf63cce9daffected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before 5b7ae04969f822283a95c866967e42b4d75e0eefaffected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before 912c4b66bef713a20775cfbf3b5e9bd71525c716affected · git
- 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 and later · before 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08affected · git
- before 5.4not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	bpftool	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-abi-stablelists	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-core	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-cross-headers	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-debug	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-debug-core	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-debug-devel	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-debug-modules	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-debug-modules-extra	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-devel	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-doc	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-headers	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-modules	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-modules-extra	before 4.18.0-553.82.1.el8_10	4.18.0-553.82.1.el8_10
AlmaLinux:8	kernel-rt	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-core	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-debug	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-debug-core	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-debug-devel	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-debug-modules	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-debug-modules-extra	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-devel	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10
AlmaLinux:8	kernel-rt-modules	before 4.18.0-553.82.1.rt7.423.el8_10	4.18.0-553.82.1.rt7.423.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2025-39862Sep 19, 2025 · wifi: mt76: mt7915: fix list corruption after hardware restart
31Monitor
← EarlierCVE-2025-39863Sep 19, 2025 · wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
31Monitor
Later →CVE-2025-39865Sep 19, 2025 · tee: fix NULL pointer dereference in tee_shm_put
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	26e84445f02ce6b2fe5f3e0e28ff7add77f35e08	Vendor (CNA)
Linux Linux	5b7ae04969f822283a95c866967e42b4d75e0eef	Vendor (CNA)
Linux Linux	6854476d9e1aeaaf05ebc98d610061c2075db07d	Vendor (CNA)
Linux Linux	912c4b66bef713a20775cfbf3b5e9bd71525c716	Vendor (CNA)
Linux Linux	a8bb681e879ca3c9f722aa08d3d7ae41c42a8807	Vendor (CNA)
Linux Linux	a97a9791e455bb0cd5e7a38b5abcb05523d4e21c	Vendor (CNA)
Linux Linux	b7d08929178c16398278613df07ad65cf63cce9d	Vendor (CNA)
Linux Linux	ff040562c10a540b8d851f7f4145fa112977f853	Vendor (CNA)
azl3 kernel 6.6.104.2-4 on Azure Linux 3.0	6.6.112.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
almalinux:bpftool	4.18.0-553.82.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel	4.18.0-553.82.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-core	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-core	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-devel	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-devel	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-modules	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-modules-extra	4.18.0-553.82.1.rt7.423.el8_10 · AlmaLinux:8	Package registry (OSV)
debian:linux	6.1.153-1 · Debian:12	Package registry (OSV)
red hat:kernel-rt	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-core	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-core	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-debuginfo	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-devel	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-kvm	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-modules	0:4.18.0-553.82.1.rt7.423.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records