Use-after-free in Linux kernel - CVE-2026-72251

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Main Vulnerability Database Vulnerabilities #VU143190

Use-after-free in Linux kernel - CVE-2026-72251

Published: August 16, 2026


Vulnerability identifier: #VU143190
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-2026-72251
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to use-after-free in nf_nat_sip in net/netfilter/nf_nat_sip.c when handling cloned socket buffers during SIP NAT processing. A local user can trigger packet processing with a cloned skb to cause a denial of service.

The issue occurs in the reply-direction destination port mangling path for SIP traffic.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server for SAP Applications 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 Server 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
openSUSE Leap
Ubuntu
kgraft-patch-4_12_14-122_328-default
kernel-livepatch-SLE15-SP4_Update_59-debugsource
kernel-livepatch-5_14_21-150400_24_240-default
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo
kernel-livepatch-6_4_0-150600_23_135-default
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_31-debugsource
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-livepatch-6_4_0-150700_53_81-default
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-default-base
kernel-default-man
kernel-macros
kernel-devel
kernel-default
kernel-default-debugsource
kernel-default-kgraft-devel
kernel-default-debuginfo
kernel-default-kgraft
kernel-source
kernel-syms
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
ocfs2-kmp-default
dlm-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
kernel-default-devel
kernel-default-devel-debuginfo
kernel-source-rt
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-obs-build
kernel-docs
kernel-obs-build-debugsource
kernel-64kb
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-64kb-devel
kernel-zfcpdump-debugsource
kernel-64kb-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-syms-rt
ocfs2-kmp-rt-debuginfo
kselftests-kmp-rt
ocfs2-kmp-rt
kernel-rt_debug-devel
gfs2-kmp-rt-debuginfo
kernel-rt_debug-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-rt-livepatch-devel
kernel-rt-extra-debuginfo
reiserfs-kmp-rt
kselftests-kmp-rt-debuginfo
dlm-kmp-rt
gfs2-kmp-rt
kernel-rt-vdso
dlm-kmp-rt-debuginfo
kernel-rt_debug
kernel-devel-rt
kernel-rt_debug-debugsource
kernel-rt_debug-devel-debuginfo
kernel-rt-extra
kernel-rt_debug-vdso
kernel-rt-vdso-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-optional
cluster-md-kmp-rt
kernel-rt-optional-debuginfo
kernel-rt-livepatch
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall
kernel-kvmsmall-debugsource
dlm-kmp-64kb
ocfs2-kmp-64kb-debuginfo
dlm-kmp-64kb-debuginfo
kselftests-kmp-64kb-debuginfo
gfs2-kmp-64kb
reiserfs-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-64kb-extra
kernel-default-extra-debuginfo
kernel-debug
kernel-debug-devel-debuginfo
kernel-debug-debugsource
kernel-debug-devel
kernel-debug-debuginfo
kernel-obs-qa
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso
kernel-default-vdso-debuginfo
kernel-debug-vdso
kernel-kvmsmall-devel
kernel-default-optional-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-extra
kernel-default-optional
kselftests-kmp-default
kernel-64kb-optional
gfs2-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
cluster-md-kmp-64kb
kselftests-kmp-64kb
ocfs2-kmp-64kb
kernel-64kb-extra-debuginfo
cluster-md-kmp-64kb-debuginfo
kernel-default-base-rebuild
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure
linux (Ubuntu package)
linux-gcp (Ubuntu package)

How to mitigate CVE-2026-72251

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-SLE15-SP4_Update_59-debugsource - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default - 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-livepatch-6_4_0-150600_23_135-default - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo - update to 1-150600.13.3.4
kernel-livepatch-SLE15-SP6_Update_31-debugsource - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
kernel-default-base - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2.150400.24.120.2, 6.4.0-150600.23.135.1.150600.12.62.4, 6.4.0-150700.53.81.1.150700.17.45.1
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, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-devel - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-debugsource - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
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, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-kgraft - update to 4.12.14-122.328.1
kernel-source - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-syms - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-base-debuginfo - update to 4.12.14-122.328.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
dlm-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
gfs2-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-devel - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-source-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debuginfo - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debugsource - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-obs-build - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-docs - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-obs-build-debugsource - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
reiserfs-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-livepatch-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-livepatch - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-syms-rt - update to 5.14.21-150500.13.161.1
ocfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt - update to 5.14.21-150500.13.161.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-devel - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.161.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
dlm-kmp-rt - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt-vdso - update to 5.14.21-150500.13.161.1
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug - update to 5.14.21-150500.13.161.1
kernel-devel-rt - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-extra - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.161.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-optional - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch - update to 5.14.21-150500.13.161.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.135.1
kernel-docs-html - update to 6.4.0-150600.23.135.1
kernel-source-vanilla - update to 6.4.0-150600.23.135.1
kernel-kvmsmall - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.135.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-extra - update to 6.4.0-150600.23.135.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-debug - update to 6.4.0-150600.23.135.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-debugsource - update to 6.4.0-150600.23.135.1
kernel-debug-devel - update to 6.4.0-150600.23.135.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.135.1
kernel-obs-qa - update to 6.4.0-150600.23.135.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.135.1
kernel-default-vdso - update to 6.4.0-150600.23.135.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-vdso - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.135.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.135.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.135.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-optional - update to 6.4.0-150600.23.135.1
kselftests-kmp-default - update to 6.4.0-150600.23.135.1
kernel-64kb-optional - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.135.1.150600.12.62.4
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
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

External References

Related Security Bulletins