Use-after-free in Linux kernel - CVE-2026-64037
Published: July 20, 2026
Vulnerability identifier: #VU138615
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-2026-64037
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 and trigger a use-after-free.
The vulnerability exists due to a use-after-free in iwl_mld_tx_tso_segment() in the iwlwifi MLD driver when processing TSO segmentation with AMSDU disabled for a TID. A local user can trigger TSO segmentation that produces zero subframes to cause a denial of service and trigger a use-after-free.
The issue occurs when the AMSDU length field is set to the sentinel value 1, which causes gso_size to become 0 and leads to excessive packet segmentation and TX completion activity.
How to mitigate CVE-2026-64037
Install security update from vendor's repository.