Improper initialization in Linux kernel - CVE-2026-98848

Vulnerability identifier: #VU157217

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98848

CWE-ID: CWE-665

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to potentially cause a denial of service on systems configured to trap bounds-sanitizer violations.

The vulnerability exists due to improper initialization of the array element count in ac100_rtc_register_clks() in the Linux kernel AC100 RTC driver when probing the device with CONFIG_UBSAN_BOUNDS, CONFIG_UBSAN_TRAP, and a compiler supporting __counted_by. A local privileged user can trigger the affected probe path, if permitted, to cause a bounds-sanitizer trap because clock pointers are stored in .hws[] before its associated .num count is initialized.

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/160619b38707241e22569f9c983a4b3d0890996a
• https://git.kernel.org/stable/c/6a4117eee82dd85f11bf898bf66026764011eeb6
• https://git.kernel.org/stable/c/6bb55381daf1a1bed0657189a1396e7467712525
• https://git.kernel.org/stable/c/ad1bf77039cba83373bf1eff3784655e3e3ed2ab
• https://git.kernel.org/stable/c/e77c5fc1f39fdb06ecd1f55b101eea1e1db2ffef

• Improper initialization in Linux kernel rtc driver
• SUSE update for the Linux Kernel