Out-of-bounds write in Linux kernel - CVE-2026-98836

Vulnerability identifier: #VU157204

CSH Severity: Medium

CVSS v4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98836

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows an attacker with physical access to system to corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to an out-of-bounds write in the Linux kernel ALSA Line6 driver's submit_audio_out_urb() function when preparing playback packets whose calculated sizes exceed the allocated output buffer capacity. An attacker with physical access to system can connect a specially crafted USB device declaring a large input endpoint packet size and a small output endpoint packet size to cause playback data copies or idle-stream memory initialization to write beyond the allocated buffer and corrupt kernel memory.

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/3f75da1e4ee699f6650d23d6897cf443b01856c7
• https://git.kernel.org/stable/c/61b0a5a114fa4552892da5c0ff2f42e63bf08c6b
• https://git.kernel.org/stable/c/933d8ac23388eb208ea195231d682dce0bec86ca
• https://git.kernel.org/stable/c/a84371be89c39ccc46c7af8b9eb15c448df9265f
• https://git.kernel.org/stable/c/b78748424f29f07d310484b2b36afdececa74389

• Out-of-bounds write in Linux kernel usb line6
• SUSE update for the Linux Kernel