Integer underflow in Linux kernel - CVE-2026-99182
Published: October 29, 2026
Vulnerability identifier: #VU158391
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99182
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service by triggering an invalid shift during audio capture configuration.
The vulnerability exists due to integer underflow in the Linux kernel's sof_ipc4_prepare_copier_module() function in sound/soc/sof/ipc4-topology.c when configuring aggregated ALH capture streams. A local user can trigger configuration of a capture stream with fewer channels than aggregated devices, causing step to become zero and step - 1 to underflow to UINT_MAX, which produces an out-of-bounds shift in GENMASK() and may disrupt audio processing or system availability.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99182
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2