NVD / CVE Program· CNA Linux

CVE-2026-46047: net: qrtr: ns: Fix use-after-free in driver remove()

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: 0.12% (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 0f313eb6a8f6dffa491373cf3afab979fa1c02f4, 2e127ceb1c415e246076d8e09e23e443a7a2038f, 4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.

Low priority for now. Upgrade to Linux Linux 0f313eb6a8f6dffa491373cf3afab979fa1c02f4, 2e127ceb1c415e246076d8e09e23e443a7a2038f, 4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: net: qrtr: ns: Fix use-after-free in driver remove() In the remove callback, if a packet arrives after destroy_workqueue() is called, but before sock_release(), the qrtr_ns_data_ready() callback will try to queue the work, causing use-after-free issue. Fix this issue by saving the default 'sk_data_ready' callback during qrtr_ns_init() and use it to replace the qrtr_ns_data_ready() callback at the start of remove(). This ensures that even if a packet arrives after destroy_workqueue(), the work struct will not be dereferenced. Note that it is also required to ensure that the RX threads are completed before destroying the workqueue, because the threads could be using the qrtr_ns_data_ready() callback.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 27, 2026
Updated: Oct 15, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

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

Affected versions

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

linux linux kernel5.7 and later · before 5.10.258
linux linux kernel5.11 and later · before 5.15.209
linux linux kernel5.16 and later · before 6.1.175
linux linux kernel6.2 and later · before 6.6.140
linux linux kernel6.7 and later · before 6.12.86
linux linux kernel6.13 and later · before 6.18.27
linux linux kernel6.19 and later · before 7.0.4

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
- 5.7affected
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before 65168712c216584ff482a7d1a67589f2079b2634affected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before dff081c3602f2fd810f69ef47945a226980dd05daffected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before 4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167affected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before 0f313eb6a8f6dffa491373cf3afab979fa1c02f4affected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before db3c60ec772de30acae92d560dfcc5258e58dbe8affected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before 2e127ceb1c415e246076d8e09e23e443a7a2038faffected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before f96779e916576e81430ebb326baff6e433fef8aeaffected · git
- 0c2204a4ad710d95d348ea006f14ba926e842ffd and later · before 7809fea20c9404bfcfa6112ec08d1fe1d3520bebaffected · git
- before 5.7not 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 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.86-1	6.12.86-1
Debian:14	linux	before 7.0.4-1	7.0.4-1

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
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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-2026-46044May 27, 2026 · ipmi:ssif: Clean up kthread on errors
22Monitor
← EarlierCVE-2026-46046May 27, 2026 · ext4: fix missing brelse() in ext4_xattr_inode_dec_ref_all()
22Monitor
Later →CVE-2026-46050May 27, 2026 · md/raid10: fix deadlock with check operation and nowait requests
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	0f313eb6a8f6dffa491373cf3afab979fa1c02f4	Vendor (CNA)
Linux Linux	2e127ceb1c415e246076d8e09e23e443a7a2038f	Vendor (CNA)
Linux Linux	4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167	Vendor (CNA)
Linux Linux	65168712c216584ff482a7d1a67589f2079b2634	Vendor (CNA)
Linux Linux	7809fea20c9404bfcfa6112ec08d1fe1d3520beb	Vendor (CNA)
Linux Linux	db3c60ec772de30acae92d560dfcc5258e58dbe8	Vendor (CNA)
Linux Linux	dff081c3602f2fd810f69ef47945a226980dd05d	Vendor (CNA)
Linux Linux	f96779e916576e81430ebb326baff6e433fef8ae	Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.0	6.6.141.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · 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-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/0f313eb6a8f6dffa491373cf3afab979fa1c02f4

Show all references (8 more)

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

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