Use-after-free in Linux kernel - CVE-2026-98754

Vulnerability identifier: #VU157104

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-2026-98754

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 vcc driver when terminal cleanup races with LDC callback processing. A local user can potentially trigger concurrent vcc_cleanup() and vcc_event() execution, causing a callback to dereference freed memory through tty->port 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/03b49c991abb8d021ca6fe51cd173447236b0552
• https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4
• https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32
• https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae
• https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c

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