Use-after-free in Linux kernel - CVE-2026-72323

Vulnerability identifier: #VU143113

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72323

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in the IGMP timer callback when processing incoming IGMP queries during device teardown. A remote attacker can send a crafted IGMP query to cause a denial of service.

Exploitation requires a race between device destruction and IGMP query processing.

Linux kernel
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Live Patching
Ubuntu
kgraft-patch-4_12_14-122_328-default
kernel-livepatch-5_14_21-150400_24_240-default
kernel-livepatch-SLE15-SP4_Update_59-debugsource
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo
kernel-default-base-debuginfo
kernel-default
kernel-default-debugsource
kernel-default-kgraft-devel
kernel-default-debuginfo
kernel-default-kgraft
kernel-syms
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default
dlm-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
kernel-default-man
kernel-macros
kernel-devel
kernel-source
kernel-default-devel
kernel-default-base
kernel-default-devel-debuginfo
kernel-source-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt
kernel-obs-build
kernel-docs
kernel-obs-build-debugsource
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-default-livepatch-devel
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-debuginfo
kernel-default-livepatch
kernel-64kb-devel-debuginfo
linux (Ubuntu package)
linux-gcp (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kgraft-patch-4_12_14-122_328-default - update to 1-8.5.1
kernel-livepatch-5_14_21-150400_24_240-default - update to 1-150400.9.5.1
kernel-livepatch-SLE15-SP4_Update_59-debugsource - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo - update to 1-150400.9.5.1
kernel-default-base-debuginfo - update to 4.12.14-122.328.1
kernel-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-default-debugsource - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-default-kgraft-devel - update to 4.12.14-122.328.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-default-kgraft - update to 4.12.14-122.328.1
kernel-syms - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
ocfs2-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
dlm-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
gfs2-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
cluster-md-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-default-man - update to 4.12.14-122.328.1
kernel-macros - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1
kernel-devel - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1
kernel-source - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1
kernel-default-devel - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-default-base - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2.150400.24.120.2
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
kernel-source-rt - update to 5.14.21-150400.15.186.1
kernel-rt-debugsource - update to 5.14.21-150400.15.186.1
kernel-rt-debuginfo - update to 5.14.21-150400.15.186.1
kernel-rt - update to 5.14.21-150400.15.186.1
kernel-obs-build - update to 5.14.21-150400.24.240.1
kernel-docs - update to 5.14.21-150400.24.240.1
kernel-obs-build-debugsource - update to 5.14.21-150400.24.240.1
kernel-zfcpdump-debugsource - update to 5.14.21-150400.24.240.2
kernel-zfcpdump-debuginfo - update to 5.14.21-150400.24.240.2
kernel-zfcpdump - update to 5.14.21-150400.24.240.2
kernel-default-livepatch-devel - update to 5.14.21-150400.24.240.2
reiserfs-kmp-default-debuginfo - update to 5.14.21-150400.24.240.2
reiserfs-kmp-default - update to 5.14.21-150400.24.240.2
kernel-64kb - update to 5.14.21-150400.24.240.2
kernel-64kb-debugsource - update to 5.14.21-150400.24.240.2
kernel-64kb-devel - update to 5.14.21-150400.24.240.2
kernel-64kb-debuginfo - update to 5.14.21-150400.24.240.2
kernel-default-livepatch - update to 5.14.21-150400.24.240.2
kernel-64kb-devel-debuginfo - update to 5.14.21-150400.24.240.2
linux (Ubuntu package) - addressed in versions 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-34.34~24.04.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1020.20
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14

• https://git.kernel.org/stable/c/165258303357e54b75fc19b341ae2a2b7c9e3910
• https://git.kernel.org/stable/c/40a1e998cb266ed4cb529a0bb4fee2b0ba732702
• https://git.kernel.org/stable/c/75e984fe0cb9e7fbde0c8ee838c61ce8573d3ea3
• https://git.kernel.org/stable/c/7b19c0f81ed1fdaec6bc522569be367199a9edf3
• https://git.kernel.org/stable/c/8d4394ffa40508e0de72f464af351f6ca6a6cdc3

• Use-after-free in Linux kernel ipv4
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel