Use-after-free in Linux kernel - CVE-2026-53247

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Main Vulnerability Database Vulnerabilities #VU135512

Use-after-free in Linux kernel - CVE-2026-53247

Published: June 26, 2026


Vulnerability identifier: #VU135512
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53247
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in the mtk_eth_soc driver metadata dst teardown path when tearing down the device while packets still hold a non-refcounted pointer to metadata_dst. A local user can trigger the teardown condition to cause a denial of service.

The issue arises in the RX path because skb_dst_set_noref() requires RCU read-side protection and the destination object must remain valid until all RCU readers have completed.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gke (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-aws-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-53247

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-138.138+fips1, 6.8.0-1035.36, 6.8.0-1048.52, 6.8.0-1060.63.1, 6.8.0-1063.66, 6.8.0-1063.66+fips1, 6.8.0-1065.73~22.04.1, 6.8.0-1066.74, 6.8.0-1066.74+fips1, 6.8.0-1066.74~22.04.1, 6.8.1-1058.59, 6.8.1-1058.59~22.04.1, 7.0.0-29.29, 7.0.0-29.29.1, 7.0.0-1009.9, 7.0.0-1010.10, 7.0.0-1011.11, 7.0.0-1016.16
linux-gke (Ubuntu package) - addressed in versions 6.8.0-138.138.1, 6.8.0-138.138.1~22.04.1, 6.8.0-1061.69
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-138.138~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1032.34~22.04.1, 6.8.0-1063.66~22.04.1, 6.8.0-1064.71, 6.8.0-1064.71~22.04.1, 6.8.0-1065.73+fips1
linux-azure-6.8 (Ubuntu package) - addressed in versions 6.8.0-1060.63~22.04.1, 6.8.0-1063.64, 6.8.0-1063.64~22.04.1, 6.8.0-1063.67, 6.8.0-1065.73~22.04.1, 6.8.0-2052.54
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1061.64, 6.8.0-1061.64.1, 6.8.0-1061.64~22.04.1, 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1032.32
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-29.29~24.04.2
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1005.6, 7.0.0-1010.10
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1010.10
linux-aws-7.0 (Ubuntu package) - update to 7.0.0-1010.10~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins