Double free in Linux kernel - CVE-2026-53233

Vulnerability identifier: #VU135523

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-2026-53233

CWE-ID: CWE-415

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 double free in netdev_nl_bind_rx_doit() in net/core/netdev-genl.c when handling netlink bind requests that trigger a genlmsg_reply() failure. A local user can send a crafted request with an already-full receive buffer to cause a denial of service.

Linux kernel
SUSE Linux Micro
Ubuntu
kernel-livepatch-6_12_0-160000_35-default
kernel-livepatch-SLE16_Update_14-debugsource
kernel-livepatch-6_12_0-160000_35-default-debuginfo
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-7.0 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
kernel-livepatch-6_12_0-160000_6-default-debuginfo
kernel-livepatch-SLE16_Update_1-debugsource
kernel-livepatch-6_12_0-160000_6-default

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_12_0-160000_35-default - update to 4-160000.1.1
kernel-livepatch-SLE16_Update_14-debugsource - update to 4-160000.1.1
kernel-livepatch-6_12_0-160000_35-default-debuginfo - update to 4-160000.1.1
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1011.11, 7.0.0-1014.14
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13
linux-ibm (Ubuntu package) - update to 7.0.0-1013.13
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia (Ubuntu package) - update to 7.0.0-1018.18
linux-nvidia-7.0 (Ubuntu package) - update to 7.0.0-1018.18~24.04.1
linux-raspi (Ubuntu package) - update to 7.0.0-1019.19
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2018.18
kernel-livepatch-6_12_0-160000_6-default-debuginfo - update to 15-160000.1.1
kernel-livepatch-SLE16_Update_1-debugsource - update to 15-160000.1.1
kernel-livepatch-6_12_0-160000_6-default - update to 15-160000.1.1

• https://git.kernel.org/stable/c/9b019376cbee10c4f9184d1745fa37d156e36f30
• https://git.kernel.org/stable/c/c299321bc6232770ce378d6fa6bc46004d2d7fdb
• https://git.kernel.org/stable/c/c849de7d8757a7af801fc4a4058f71d481d367f2
• https://git.kernel.org/stable/c/e055ca9205d3eb6aec3e5fe4ecc18abbbf18c599

• Double free in Linux kernel core
• SUSE update for the Linux Kernel (Live Patch 14 for SUSE Linux Enterprise 16)
• SUSE update for the Linux Kernel (Live Patch 1 for SUSE Linux Enterprise 16)
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-azure
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-ibm
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia-7.0