Use-after-free in Linux kernel - CVE-2026-53388

Vulnerability identifier: #VU138882

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-2026-53388

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 fuse_try_move_folio() in the FUSE subsystem when moving a page cache folio during FUSE read handling. A local user can trigger a race condition to cause a denial of service.

The issue occurs because the request is not re-locked on the success path, allowing request abortion to free fuse_io_args while subsequent copy logic still accesses it.

Linux kernel
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
Legacy Module
SUSE Linux Enterprise Live Patching
Public Cloud Module
Development Tools Module
Basesystem Module
openEuler
Ubuntu
kernel-livepatch-6_4_0-150700_53_81-default
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-headers
kernel-obs-build-debugsource
kernel-zfcpdump-debugsource
kernel-obs-build
kernel-syms
kernel-docs
kernel-64kb-debugsource
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debuginfo
kernel-64kb
kernel-zfcpdump-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-extra
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-azure
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-default-extra-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
kernel-default-debuginfo
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debugsource
kernel-default
kernel-default-devel-debuginfo
kernel-default-devel
kernel-macros
kernel-zfcpdump
cluster-md-kmp-default-debuginfo
kernel-default-base
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150700_53_81-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
kernel-devel - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-debugsource - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-debuginfo - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
bpftool-debuginfo - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
bpftool - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-source - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-tools - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-tools-debuginfo - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-tools-devel - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
perf - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
perf-debuginfo - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
python2-perf - update to 4.19.90-2608.2.0.0384
python2-perf-debuginfo - update to 4.19.90-2608.2.0.0384
python3-perf - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
python3-perf-debuginfo - addressed in versions 4.19.90-2608.2.0.0384, 5.10.0-327.0.0.228
kernel-headers - update to 5.10.0-327.0.0.228
kernel-obs-build-debugsource - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.81.1
kernel-obs-build - update to 6.4.0-150700.53.81.1
kernel-syms - update to 6.4.0-150700.53.81.1
kernel-docs - update to 6.4.0-150700.53.81.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb-devel - update to 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.81.1
kernel-source - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-extra - update to 6.4.0-150700.53.81.1
kernel-default-livepatch - update to 6.4.0-150700.53.81.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.81.1
kernel-devel - update to 6.4.0-150700.53.81.1
gfs2-kmp-default - update to 6.4.0-150700.53.81.1
cluster-md-kmp-default - update to 6.4.0-150700.53.81.1
kernel-default-debuginfo - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default - update to 6.4.0-150700.53.81.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
dlm-kmp-default - update to 6.4.0-150700.53.81.1
kernel-default-debugsource - update to 6.4.0-150700.53.81.1
kernel-default - update to 6.4.0-150700.53.81.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-devel - update to 6.4.0-150700.53.81.1
kernel-macros - update to 6.4.0-150700.53.81.1
kernel-zfcpdump - update to 6.4.0-150700.53.81.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-base - update to 6.4.0-150700.53.81.1.150700.17.45.1
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-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

• https://git.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25
• https://git.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407
• https://git.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2
• https://git.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4
• https://git.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6
• https://git.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120
• https://git.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677
• https://git.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666

• Use-after-free in Linux kernel fuse
• openEuler 22.03 LTS SP4 update for kernel
• openEuler 20.03 LTS SP4 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0
• SUSE update for the Linux Kernel