Use-after-free in Linux kernel - CVE-2025-39698

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Main Vulnerability Database Vulnerabilities #VU114963

Use-after-free in Linux kernel - CVE-2025-39698

Published: September 8, 2025 / Updated: September 25, 2025


Vulnerability identifier: #VU114963
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-2025-39698
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a use-after-free error within the io_futex_wait() function in io_uring/futex.c. A local user can execute arbitrary code with elevated privileges.


Affected software

Linux kernel
Debian Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Ubuntu
Netezza Appliance
Verify Identity Access Digital Credentials
IBM Security Verify Access
kernel-rt-debuginfo (Red Hat package)
python3-perf-debuginfo (Red Hat package)
kernel-rt-64k-debuginfo (Red Hat package)
kernel-rt-64k-debug-debuginfo (Red Hat package)
kernel-debuginfo-common-aarch64 (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel-64k-debuginfo (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
kernel-64k-debug-debuginfo (Red Hat package)
perf-debuginfo (Red Hat package)
kernel-debuginfo-common-ppc64le (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-debuginfo-common-s390x (Red Hat package)
kernel-debug-debuginfo (Red Hat package)
kernel-debug-devel (Red Hat package)
kernel-debug-devel-matched (Red Hat package)
kernel-debuginfo (Red Hat package)
kernel-debuginfo-common-x86_64 (Red Hat package)
kernel-devel (Red Hat package)
kernel-devel-matched (Red Hat package)
kernel-tools-debuginfo (Red Hat package)
kernel-zfcpdump-debuginfo (Red Hat package)
rv (Red Hat package)
rtla (Red Hat package)
perf (Red Hat package)
kernel-headers (Red Hat package)
libperf-debuginfo (Red Hat package)
python3-perf (Red Hat package)
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
kernel (Red Hat package)
linux (Debian package)

How to mitigate CVE-2025-39698

Install update from vendor's repository.

Netezza Appliance - update to 1.0.1.0 fp278500
kernel-rt-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
python3-perf-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-rt-64k-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-rt-64k-debug-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debuginfo-common-aarch64 (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-devel-matched (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-devel (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-debug-devel-matched (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-debug-devel (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-64k-debug-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
perf-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debuginfo-common-ppc64le (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-zfcpdump-devel-matched (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-zfcpdump-devel (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debuginfo-common-s390x (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debug-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debug-devel (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debug-devel-matched (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-debuginfo-common-x86_64 (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-devel (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-devel-matched (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-tools-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-zfcpdump-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
rv (Red Hat package) - update to 5.14.0-570.49.1.el9_6
rtla (Red Hat package) - update to 5.14.0-570.49.1.el9_6
perf (Red Hat package) - update to 5.14.0-570.49.1.el9_6
kernel-headers (Red Hat package) - update to 5.14.0-570.49.1.el9_6
libperf-debuginfo (Red Hat package) - update to 5.14.0-570.49.1.el9_6
python3-perf (Red Hat package) - update to 5.14.0-570.49.1.el9_6
linux (Ubuntu package) - addressed in versions 6.8.0-94.96, 6.8.0-94.96~22.04.1, 6.8.0-1029.32~22.04.1, 6.8.0-1042.43, 6.8.0-1042.43~22.04.1, 6.8.0-1042.47, 6.8.0-1045.49
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-94.96+fips1, 6.8.0-1045.47+fips1, 6.8.0-1046.49+fips1
linux-lowlatency (Ubuntu package) - addressed in versions 6.8.0-94.96.1, 6.8.0-100.100.1, 6.8.0.1022.23, 6.8.0-1022.23
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1043.43, 6.8.0-1045.47, 6.8.0-1046.49, 6.8.0-1046.49~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1045.48.1, 6.8.0-1045.48~22.04.1
linux-azure (Ubuntu package) - update to 6.8.0-1046.52
linux-azure-fips (Ubuntu package) - update to 6.8.0-1046.52+fips1
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-raspi-realtime (Ubuntu package) - addressed in versions 6.8.0-2036.37, 6.8.1-1040.41, 6.8.1-1040.41~22.04.1
kernel (Red Hat package) - update to 6.12.0-55.37.1.el10_0
linux (Debian package) - update to 6.12.48-1

External References

Related Security Bulletins