Reliance on undefined behavior in Linux kernel - CVE-2026-98386
Published: October 15, 2026
Vulnerability identifier: #VU155930
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98386
CWE-ID: CWE-758
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to the use of ordinary memory operations on device I/O memory in the qla2xxx driver's __qla2x00_alloc_iocbs() function when clearing a QLAFX00 request ring slot. A local user can trigger the affected slot-clearing operation to cause a denial of service.
On architectures such as ARM64, a regular memset() may emit unaligned or block-zeroing instructions that are invalid for device memory, resulting in a synchronous external abort.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98386
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1