#VU124887 Use-after-free in Linux kernel - CVE-2026-31396
Published: April 6, 2026
Vulnerability identifier: #VU124887
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31396
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the macb PTP clock handling code when handling ethtool get_ts_info requests while the network interface is present but the PTP clock has been destroyed. A local user can issue a crafted ioctl request to trigger a use-after-free access and cause a denial of service.
The issue is reachable through the get_ts_info ethtool call and affects the Linux kernel macb network driver PTP clock lifecycle.
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607
- https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345
- https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7
- https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34
- https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015
- https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b