NVD / CVE Program· CNA Linux

CVE-2026-23336: wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()

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: 0.13% (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 57e39fe8da573435fa35975f414f4dc17d9f8449, 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2, 767d23ade706d5fa51c36168e92a9c5533c351a1; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 57e39fe8da573435fa35975f414f4dc17d9f8449, 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2, 767d23ade706d5fa51c36168e92a9c5533c351a1; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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: cancel rfkill_block work in wiphy_unregister() There is a use-after-free error in cfg80211_shutdown_all_interfaces found by syzkaller: BUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220 Read of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326 CPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: events cfg80211_rfkill_block_work Call Trace: <TASK> dump_stack_lvl+0x116/0x1f0 print_report+0xcd/0x630 kasan_report+0xe0/0x110 cfg80211_shutdown_all_interfaces+0x213/0x220 cfg80211_rfkill_block_work+0x1e/0x30 process_one_work+0x9cf/0x1b70 worker_thread+0x6c8/0xf10 kthread+0x3c5/0x780 ret_from_fork+0x56d/0x700 ret_from_fork_asm+0x1a/0x30 </TASK> The problem arises due to the rfkill_block work is not cancelled when wiphy is being unregistered. In order to fix the issue cancel the corresponding work in wiphy_unregister(). Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2026-12326

Published: Mar 25, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 3th 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 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

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

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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

Affected versions

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

linux linux kernel2.6.31.1 and later · before 5.10.253
linux linux kernel5.11 and later · before 5.15.203
linux linux kernel5.16 and later · before 6.1.167
linux linux kernel6.2 and later · before 6.6.130
linux linux kernel6.7 and later · before 6.12.77
linux linux kernel6.13 and later · before 6.18.17
linux linux kernel6.19 and later · before 6.19.7
linux linux kernel2.6.31
linux linux kernel7.0

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
- 2.6.31affected
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before 82a35356b5c1f75fe6a8a561db44e8d0e49da8f9affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before b2e9626a9d16b9bbbd06498c9e73c93be354dc7aaffected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before eeea8da43ab86ac0a6b9cec225eec91564346940affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before fa18639deab4a3662d543200c5bfc29bf4e23173affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before 57e39fe8da573435fa35975f414f4dc17d9f8449affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before 584279ad9ff1e8e7c5494b9fce286201f7d1f9e2affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5affected · git
- 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3 and later · before 767d23ade706d5fa51c36168e92a9c5533c351a1affected · git
- before 2.6.31not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.170-1	6.1.170-1
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.8-1	6.19.8-1

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-2026-23332Mar 25, 2026 · cpufreq: intel_pstate: Fix crash during turbo disable
22Monitor
← EarlierCVE-2026-23335Mar 25, 2026 · RDMA/irdma: Fix kernel stack leak in irdma_create_user_ah()
22Monitor
Later →CVE-2026-23338Mar 25, 2026 · drm/amdgpu/userq: Do not allow userspace to trivially triger kernel warnings
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	57e39fe8da573435fa35975f414f4dc17d9f8449	Vendor (CNA)
Linux Linux	584279ad9ff1e8e7c5494b9fce286201f7d1f9e2	Vendor (CNA)
Linux Linux	767d23ade706d5fa51c36168e92a9c5533c351a1	Vendor (CNA)
Linux Linux	82a35356b5c1f75fe6a8a561db44e8d0e49da8f9	Vendor (CNA)
Linux Linux	b2e9626a9d16b9bbbd06498c9e73c93be354dc7a	Vendor (CNA)
Linux Linux	cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5	Vendor (CNA)
Linux Linux	eeea8da43ab86ac0a6b9cec225eec91564346940	Vendor (CNA)
Linux Linux	fa18639deab4a3662d543200c5bfc29bf4e23173	Vendor (CNA)
azl3 kernel 6.6.126.1-1 on Azure Linux 3.0	6.6.130.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0	Release Notes	Microsoft (MSRC)
debian:linux	6.1.170-1 · Debian:12	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-secondary

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

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:08 PM UTC

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

References

git.kernel.org/stable/c/57e39fe8da573435fa35975f414f4dc17d9f8449

Show all references (8 more)

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

All records