Out-of-bounds write in Linux kernel - CVE-2026-74470
Published: August 16, 2026
Vulnerability identifier: #VU143315
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74470
CWE-ID: CWE-787
Exploitation vector: Local 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 an out-of-bounds write in the resp_report_zones() function in the scsi_debug driver when processing a REPORT ZONES command with a crafted allocation length on 32-bit systems. A local user can send a specially crafted REPORT ZONES command to cause a denial of service.
The issue occurs when an allocation length in the 0xFFFFFFC1 through 0xFFFFFFFF range causes a zero-sized allocation to be dereferenced on 32-bit systems.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74470
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b
- https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066
- https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e
- https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433
- https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c