Use After Free in Linux kernel - CVE-2026-23259

Vulnerability identifier: #VU124189

CSH Severity: Low

CVSS v4 BT: 4.3 [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-2026-23259

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 io_uring/rw component when handling read/write requests. A local user can trigger improper cleanup of allocated iovec structures to cause a denial of service.

Exploitation requires access to the io_uring subsystem and the ability to submit read/write requests.

Linux kernel
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
kernel-livepatch-6_4_0-150700_7_37-rt
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource
kernel-livepatch-SLE15-SP7_Update_11-debugsource
kernel-livepatch-6_4_0-150700_53_37-default
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo
kernel-syms-rt
kernel-rt-devel-debuginfo
dlm-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt
kernel-source-rt
kernel-devel-rt
gfs2-kmp-rt-debuginfo
gfs2-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
ocfs2-kmp-rt
kernel-rt-debuginfo
kernel-rt-debugsource
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
gfs2-kmp-default-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-default-debuginfo
kernel-64kb
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-default
kernel-default-devel-debuginfo
kernel-default-devel
kernel-default-debugsource
kernel-source
kernel-macros
kernel-devel
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-docs
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-default-base

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150700_7_37-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_11-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_37-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo - update to 1-150700.15.3.1
kernel-syms-rt - update to 6.4.0-150700.7.37.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.37.2
dlm-kmp-rt - update to 6.4.0-150700.7.37.2
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt - update to 6.4.0-150700.7.37.2
kernel-source-rt - update to 6.4.0-150700.7.37.2
kernel-devel-rt - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-devel - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-debugsource - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt - update to 6.4.0-150700.7.37.2
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
reiserfs-kmp-default - update to 6.4.0-150700.53.37.1
kernel-azure - update to 6.4.0-150700.53.37.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure-debugsource - update to 6.4.0-150700.53.37.1
kernel-azure-devel - update to 6.4.0-150700.53.37.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
gfs2-kmp-default - update to 6.4.0-150700.53.37.1
dlm-kmp-default - update to 6.4.0-150700.53.37.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
cluster-md-kmp-default - update to 6.4.0-150700.53.37.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.37.1
ocfs2-kmp-default - update to 6.4.0-150700.53.37.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.37.1
kernel-default-extra - update to 6.4.0-150700.53.37.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.37.1
kernel-default-livepatch - update to 6.4.0-150700.53.37.1
kernel-default-debuginfo - update to 6.4.0-150700.53.37.1
kernel-64kb - update to 6.4.0-150700.53.37.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.37.1
kernel-64kb-devel - update to 6.4.0-150700.53.37.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.37.1
kernel-default - update to 6.4.0-150700.53.37.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-default-devel - update to 6.4.0-150700.53.37.1
kernel-default-debugsource - update to 6.4.0-150700.53.37.1
kernel-source - update to 6.4.0-150700.53.37.1
kernel-macros - update to 6.4.0-150700.53.37.1
kernel-devel - update to 6.4.0-150700.53.37.1
kernel-zfcpdump - update to 6.4.0-150700.53.37.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.37.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.37.1
kernel-docs - update to 6.4.0-150700.53.37.1
kernel-obs-build - update to 6.4.0-150700.53.37.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.37.1
kernel-syms - update to 6.4.0-150700.53.37.1
kernel-default-base - update to 6.4.0-150700.53.37.1.150700.17.25.1

• https://git.kernel.org/stable/c/1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c
• https://git.kernel.org/stable/c/4b9748055457ac3a0710bf210c229d01ea1b01b9

• Use After Free in Linux kernel io_uring
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel