Use-after-free in Linux kernel - CVE-2026-64132
Published: July 20, 2026
Vulnerability identifier: #VU138495
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-2026-64132
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 ipv6 hop-by-hop ioam processing in ipv6_hop_ioam() when handling crafted ipv6 packets that trigger skb_ensure_writable() buffer reallocation. A local user can send a specially crafted packet to cause a denial of service.
The issue occurs because the hdr pointer is not refreshed after the skb data buffer is reallocated, while the trace pointer is recalculated.
How to mitigate CVE-2026-64132
Install security update from vendor's repository.