Out-of-bounds read in Linux kernel - CVE-2025-39840
Published: September 22, 2025
Vulnerability identifier: #VU115981
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-2025-39840
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the audit_compare_dname_path() function in kernel/auditfilter.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Netezza Appliance
kernel (Red Hat package)
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Netezza Appliance
kernel (Red Hat package)
How to mitigate CVE-2025-39840
Install update from vendor's repository.
Netezza Appliance - update to 1.0.1.0 fp278500
kernel (Red Hat package) - addressed in versions 5.14.0-611.20.1.el9_7, 6.12.0-124.27.1.el10_1
kernel (Red Hat package) - addressed in versions 5.14.0-611.20.1.el9_7, 6.12.0-124.27.1.el10_1