NVD / CVE Program· CNA Linux

CVE-2026-53247: net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown

Noroxi assessment

Priority: Monitor (action score 39/100)

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: 0.68% (FIRST EPSS); higher than 52.5% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 2d86aeb46d5f69c704065a8c69822582787272a1, 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e, 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 2d86aeb46d5f69c704065a8c69822582787272a1, 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e, 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst with kfree() immediately, bypassing the RCU grace period. In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from the skb to the metadata_dst. This function requires RCU read-side protection and the dst must remain valid until all RCU readers complete. Since metadata_dst_free() calls kfree() directly, a use-after-free can occur if any skb still holds a noref pointer to the dst when the driver tears it down. Replace metadata_dst_free() with dst_release() which properly goes through the refcount path: when the refcount drops to zero, it schedules the actual free via call_rcu_hurry(), ensuring all RCU readers have completed before the memory is freed.

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Published: Jun 25, 2026
Updated: Aug 5, 2026
EPSS: 0.6% · 52th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.6%

CNA vs NVD score

NVD: —
CNA · Linux: 9.8; 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.

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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?

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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 kernel6.2 and later · before 6.6.143
linux linux kernel6.7 and later · before 6.12.94
linux linux kernel6.13 and later · before 6.18.36
linux linux kernel6.19 and later · before 7.0.13
linux linux kernel7.1

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
- 6.2affected
- 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and later · before 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4affected · git
- 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and later · before 459c6f35c58cf0fd5247e55d73ddaa29571d9b7eaffected · git
- 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and later · before e634408d2b0cd939cfe019398a21fb47b7a8ffe3affected · git
- 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and later · before 2d86aeb46d5f69c704065a8c69822582787272a1affected · git
- 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and later · before 80df409e1a483676826a6c66e693dba6ac507751affected · git
- before 6.2not affected · semver
- 6.6.143 and later · up to and including 6.6.*not affected · semver
- 6.12.94 and later · up to and including 6.12.*not affected · semver
- 6.18.36 and later · up to and including 6.18.*not 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:13	linux	before 6.12.94-1	6.12.94-1
Debian:14	linux	before 7.0.13-1	7.0.13-1

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-2026-53243Jun 25, 2026 · rseq: Fix using an uninitialized stack variable in rseq_exit_user_update()
22Monitor
← EarlierCVE-2026-53244Jun 25, 2026 · VFS: fix possible failure to unlock in nfsd4_create_file()
30Monitor
Later →CVE-2026-53248Jun 25, 2026 · net: airoha: Fix use-after-free in metadata dst teardown
35Monitor

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	2d86aeb46d5f69c704065a8c69822582787272a1	Vendor (CNA)
Linux Linux	459c6f35c58cf0fd5247e55d73ddaa29571d9b7e	Vendor (CNA)
Linux Linux	72775977e89c25c99ee84d2c5baa3f86a8ba5cb4	Vendor (CNA)
Linux Linux	80df409e1a483676826a6c66e693dba6ac507751	Vendor (CNA)
Linux Linux	e634408d2b0cd939cfe019398a21fb47b7a8ffe3	Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.0	6.6.143.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.12.94-1 · Debian:13	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

Anyone who can reach it over the internet can trigger it.
No account or password is required.
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: Network
Attack complexity: Low
Privileges required: None
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:N/AC:L/PR:N/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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1

Show all references (4 more)

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

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