Use-after-free in Linux kernel - CVE-2026-98772

Vulnerability identifier: #VU157136

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98772

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.

The vulnerability exists due to a use-after-free in the Linux kernel USB serial subsystem when shared USB request completion handlers race with port teardown. A local user can potentially trigger this race during device disconnection, causing a completion handler to access freed port driver data and crash the kernel.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b
• https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443
• https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32
• https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c
• https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0

• Use-after-free in Linux kernel usb serial driver
• SUSE update for the Linux Kernel