Buffer overflow in Linux kernel - CVE-2025-71155

Vulnerability identifier: #VU121998

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-71155

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to memory corruption within the ptep_zap_swap_entry() and gmap_helper_zap_one_page() functions in arch/s390/mm/gmap_helpers.c. A local user can escalate privileges on the system.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)

Install update from vendor's repository.

linux (Ubuntu package) - addressed in versions 6.17.0-29.29, 6.17.0-29.29~24.04.1, 6.17.0-1013.15, 6.17.0-1013.15~24.04.1, 6.17.0-1014.14, 6.17.0-1015.15, 6.17.0-1017.17, 6.17.0-1023.23
linux-oracle-6.17 (Ubuntu package) - update to 6.17.0-1014.14~24.04.1
linux-azure (Ubuntu package) - addressed in versions 6.17.0-1015.15, 6.17.0-1015.15~24.04.1
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1026.26

• https://git.kernel.org/stable/c/2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7
• https://git.kernel.org/stable/c/2f393c228cc519ddf19b8c6c05bf15723241aa96

• Buffer overflow in Linux kernel s390 mm
• Ubuntu update for linux
• Ubuntu update for linux-oracle-6.17
• Ubuntu update for linux-azure
• Ubuntu update for linux-nvidia-6.17