Use-after-free in Linux kernel - CVE-2026-98758

Vulnerability identifier: #VU157109

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-2026-98758

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause memory corruption that may result in a denial of service through a kernel crash.

The vulnerability exists due to use-after-free in the Linux kernel UCSI GLINK driver when queued work executes after the UCSI instance has been unregistered during device removal. Notification callbacks can continue queuing work before device-managed cleanup releases the pmic_glink client, allowing that work to dereference the freed connector array or register and unregister the instance again. A local user can potentially exploit this removal-time race to access freed kernel state and cause a kernel crash.

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/41934f92e7a54d4080ac0b17aacc83224946785c
• https://git.kernel.org/stable/c/432b58cd959e594909a581b4974396cdbc9d4ca1
• https://git.kernel.org/stable/c/63b269ec537dc0fd26d0bd64872c26860d108c9d
• https://git.kernel.org/stable/c/ee8577de01c6b6c7dd1d76b52242c54d37a989f4

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