Use-after-free in Linux kernel - CVE-2026-64189

Vulnerability identifier: #VU138916

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-2026-64189

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to use-after-free in ip_set_dump_do() and ip_set_dump_done() in the ipset netfilter subsystem when handling netlink dump operations concurrently with ip_set_list resizing. A local user can trigger concurrent netlink dump and set creation operations to cause a denial of service.

The issue can lead to a general protection fault and kernel panic.

Linux kernel
Debian Linux
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 4.18.0-553.158.1.el8_10, 5.14.0-687.42.1.el9_8, 6.12.0-211.50.1.el10_2
kernel-rt (Red Hat package) - update to 4.18.0-553.158.1.rt7.499.el8_10
linux (Debian package) - update to 6.12.96-1

• https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab
• https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093
• https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f
• https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943

• Use-after-free in Linux kernel netfilter ipset
• Debian update for linux
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 10 update for kernel