What is CVE-2026-53247?

CVE-2026-53247 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 6.2 onward and patched in 6.6.143, 6.12.94, 6.18.36 and others. CVE-2026-53247 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53247?

CVE-2026-53247 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-53247?

Yes, CVE-2026-53247 has been patched. Fixed versions include 6.6.143, 6.12.94, 6.18.36 and others. If you are running Linux kernel 6.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53247 actively exploited?

CVE-2026-53247 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2026-53247

Critical

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.

Package Linux Kernel

Published 2026-06-25

Last modified 2026-07-07

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2026-53247 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.2 and later are affected. Fixed in 6.6.143, 6.12.94, 6.18.36, 7.0.13, 7.1 and their respective stable series.

Affected from

≥ 6.2

Fixed in

✓ 6.6.143 6.6.x ✓ 6.12.94 6.12.x ✓ 6.18.36 6.18.x ✓ 7.0.13 7.0.x ✓ 7.1

References

5 total

Kernel Git
https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1

Patch
Kernel Git
https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e

Patch
Kernel Git
https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4

Patch
Kernel Git
https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751

Patch
Kernel Git
https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3

Patch

Details

CVE ID CVE-2026-53247

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-06-25

Modified 2026-07-07

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53247?

CVE-2026-53247 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 6.2 onward and has been patched in 6.6.143, 6.12.94, 6.18.36 and others. CVE-2026-53247 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53247?

CVE-2026-53247 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-53247?

Yes. CVE-2026-53247 has been patched. Fixed versions include 6.6.143, 6.12.94, 6.18.36 and others. If you are running Linux kernel 6.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53247 actively exploited?

No. CVE-2026-53247 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.