Use-after-free in Linux kernel - CVE-2026-74388

Vulnerability identifier: #VU142762

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-2026-74388

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 a use-after-free in the ALSA OSS sequencer event handling logic when processing SysEx data embedded in MIDI events and dispatching a pending event after a sequencer port is closed concurrently. A local user can send crafted MIDI bytes that produce a pending SysEx event with a stale pointer to cause a denial of service.

The issue occurs during concurrent port closure before deferred event dispatch.

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
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 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Manager Proxy
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Live Patching
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
dlm-kmp-default
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
kernel-default-base-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
kernel-default-devel
kernel-default-base
kernel-default-devel-debuginfo
kernel-source
kernel-devel
kernel-macros
kernel-default-man
kernel-source-rt
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-obs-build
kernel-obs-build-debugsource
kernel-docs
kernel-64kb-debugsource
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-64kb
kernel-default-livepatch-devel
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-default-livepatch
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-devel

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
dlm-kmp-default - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.2
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
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
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-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 - 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-macros - addressed in versions 4.12.14-122.328.1, 5.14.21-150400.24.240.1
kernel-default-man - update to 4.12.14-122.328.1
kernel-source-rt - update to 5.14.21-150400.15.186.1
kernel-rt - update to 5.14.21-150400.15.186.1
kernel-rt-debuginfo - update to 5.14.21-150400.15.186.1
kernel-rt-debugsource - update to 5.14.21-150400.15.186.1
kernel-obs-build - update to 5.14.21-150400.24.240.1
kernel-obs-build-debugsource - update to 5.14.21-150400.24.240.1
kernel-docs - update to 5.14.21-150400.24.240.1
kernel-64kb-debugsource - 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-default-livepatch-devel - update to 5.14.21-150400.24.240.2
kernel-zfcpdump - update to 5.14.21-150400.24.240.2
kernel-zfcpdump-debuginfo - update to 5.14.21-150400.24.240.2
kernel-zfcpdump-debugsource - update to 5.14.21-150400.24.240.2
kernel-default-livepatch - update to 5.14.21-150400.24.240.2
kernel-64kb-debuginfo - update to 5.14.21-150400.24.240.2
kernel-64kb-devel-debuginfo - update to 5.14.21-150400.24.240.2
kernel-64kb-devel - update to 5.14.21-150400.24.240.2

• https://git.kernel.org/stable/c/6dc781778b595be94c31395b2cb167f65145d91f
• https://git.kernel.org/stable/c/7aad70cabd8f34cf11a9593fcd3f2ac3f5496943
• https://git.kernel.org/stable/c/7c349b4f2a603202fb8c363bd2774a22ac2fddf3

• Use-after-free in Linux kernel seq oss
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel