Use-after-free in Linux kernel - CVE-2026-23445
Published: April 6, 2026
Vulnerability identifier: #VU124924
CSH Severity: Low
CVSS v4.0: 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-2026-23445
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the igc driver XDP TX timestamp handling when shutting down an XDP application with TX timestamping while the interface link remains up. A local user can trigger TX ring shutdown and concurrent IRQ handling to cause a denial of service.
The issue occurs because stale xsk_meta pointers remain after TX ring shutdown and are later accessed by the interrupt handler, leading to a kernel page fault. TX timestamps on other queues remain unaffected.
How to mitigate CVE-2026-23445
Install security update from vendor's repository.